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The Importance of the 30-Minute Population Radius on MLB Attendance

In 1992, the San Francisco Giants almost moved to St. Petersburg, Florida. Before the i’s could be dotted and the t’s crossed, new ownership bought the team and the Giants stayed in their Bay Area. Less than 10 years later, the Tampa Bay area received the Devil Rays.

While their results on the field have been somewhat similar since 2008 (Rays winning %: .552, Giants winning % .526), the two teams couldn’t be more different in regards to stadium experience. Since Oct 1, 2010, the Giants have sold out every game at AT&T Park, while the Rays have had 14 regular season sell-outs total since 2010. The Giants play in a beautiful new ballpark on the water, while the Rays play in a dilapidated 30-year old dome.

There is one other major difference when we look at the Giants and the Rays (besides the fact the Giants did draft Buster Posey):

Last year, of the US-based teams, the Giants had the smallest difference in weekend/weekend attendance; the Rays had the largest. By selling out every game, the Giants maintained an average Monday through Thursday attendance of 41,588 and a Friday through Sunday average of 41,589. An average of one person squeezed in to AT&T Park on the weekends.

Meanwhile, at Tropicana Field, the Rays averaged only 14,297 fans per game Monday through Thursday. This was the lowest average weekday attendance in Major League Baseball. On the weekends, however, the Rays averaged 21,692 fans per game. While still the lowest weekend average in Major League Baseball, the Rays saw a 51.7% average increase in attendance on the weekends.

There are many reasons why the Rays struggle with attendance. Many fans and residents point to the condition of the stadium, the demographics, and lack of mass transit as reason for not going. But one of the biggest and least-discussed reasons is that few people actually live near Tropicana Field. According to Maury Brown’s 2011 research on population, the Rays are dead last in population with a 30-mile radius of their ballpark.

A definite correlation exists between the population living within 30 minutes of a ballpark and the difference between weekend and weekday attendance. With only a few exceptions, teams with a 30-minute radius larger than 2 million have smaller weekend/weekday attendance differences. Teams that play in a population radius of less than 2 million, on the other hand, tend to have higher weekend/weekday differences.

Here is a breakdown of the 2014 MLB attendance:

2014 MLB attendance

Only the Chicago White Sox and Washington Nationals have more than 2 million people within 30 minutes of their ballpark and had an average weekend difference greater than 20%. Teams with less than 2 million people within 30 minutes of their ballpark who saw a smaller than 20% difference in average weekday to weekend attendance included the Cardinals, Twins, Rangers, and Marlins. The circumstances behind these fanbases should be studied further.

Looking at the data graphically, it is best to omit the New York teams, as the each can draw from a 30-minute population of over 8 million people, more than double any other team on the list. Removing the Mets and Yankees, we see the following:

MLB 2014 weekend weekday 30 min radius

On the left side of the chart, we see teams with smaller average weekend-to-weekday attendance difference. Notice they are all above 1.5 million and a majority are over 2 million. As we move right on the chart, the percentage gets higher and the dots trend lower, with the exception of the White Sox, who are the top-right dot. The Rays are also evident, as they are the dot in the lower-right.

Local population is important as they are the pool of fans who can most easily get to the ballpark after a day at the office. These are the fans who can also get home from a 3-hour game at a reasonable time. Having a larger local pool to draw from makes it easier for teams to pack their ballpark during fans’ valuable weekday time. It is easier to fill the average major league ballpark on weekdays when 8 million potential fans live within 30 minutes than when a majority of the area’s 3 million people have to travel over an hour each way.

Weekends, on the other hand, usually allow for more time to travel to the ballpark. Fans also don’t have to rush home to get to sleep before the next work day. Fridays and the rare Sunday night game are the odd exceptions as they have a time crunch on one side of the trip, but not the other.

While they don’t have the largest local population, the San Francisco Giants are doing a great job getting local residents to the ballpark. Fans show up, and they show up every day. (Yes, there are articles disputing exactly how many tickets are actually sold.)

The Tampa Bay Rays, on the other hand, will continue to struggle with attendance as long as they have less than 1 million fans living within 30 minutes of Tropicana Field. This is one of clearest reasons for a move to downtown Tampa, where the Tampa Bay Lightning see weekday/weekend attendance differences of approximately 5%. A move to the center of their market could vastly increase the pool of fans within 30 minutes of a Rays game. Or barring a new stadium in a new location, the Rays could build homes, apartments, and condos in an attempt to surround Tropicana Field with at least one million new neighbors.

Looking at Attendance after Aces are Dealt

As baseball season and the summer months heat up, so too do the trade rumors. Almost every year, baseball media and fans postulate and prognosticate who might be traded before the annual trading deadline.

This year, the big fish on the market is Rays left-hander David Price. With only one year left on his contract, it is unlikely the Rays can afford to keep the former Cy Young Award Winner. But with the team winning eight in a row and 19 of their last 24, trading their ace doesn’t seem like a sure deal anymore. Most recent reports say the Rays management will wait until the absolute last minute to make a decision on if, where, and for whom the popular lefty will be traded.

With the Rays’ status with regards to popularity and market, some of the talk in regards to trading David Price has wound into the realm of attendance. The Rays are currently last in the Major Leagues in attendance, and some are concerned attendance could drop even lower if they traded their best pitcher. There are those who think Rays fans would consider the trade a message from ownership to wait until next year. And if that’s the message, why not wait until next year to buy a ticket?

To estimate how Rays attendance might react to a possible trade of David Price, I looked at 12 prior trades of ace pitchers over the last 37 years. Via, I looked at attendance before and after each trade. I also looked at winning percentage before and after.

My goal is to see if two maxims hold true:

  1. Attendance goes up when teams win and goes down when teams lose.
  2. A team that trades its best pitcher will have a worse record after the trade.

Hence, if attendance is attached to winning and ace pitchers are attached to winning, attendance should drop after ace pitchers are traded.

Is this really the case? Or is attendance in some cities more sensitive to major trades than others?

Let’s begin by looking at the granddaddy of superstar pitcher trades: the Tom Seaver trade. On June 15, 1977, after a slight tiff with ownership, the Mets shipped the franchise’s first ace to the Reds for Steve Henderson, Pete Flynn, Pat Zachary, and Dan Norman. The Mets were bad before but worse after and attendance followed suit.

Tom Seaver trade attendance

Twelve years later, in 1989, two aces were traded during the season. On May 25th, the Mariners moved ace Mark Langston to the Expos for a bevy of prospects headlined by future ace Randy Johnson. Mariners fans reduced their attendance by nearly the same amount Mets fans did in 1977. Although playing .500 baseball prior to the trade, the Mariners winning percentage dropped significantly after the trade.

Langston trade

Two months after the Langston trade, the Minnesota Twins traded 1988 Cy Young Award winner Frank Viola to the Mets for Rick Aguilera, Kevin Tapani, and three other pitchers. The Twins were two games under .500 at the time of the trade, and then played .500 after the trade. Despite their slight improvement, attendance dropped 12.95% after the Viola trade.

Viola trade

We fast-forward to 1998 and another Mariners trade. During the 1998 season, the Mariners dealt the aforementioned Johnson to the Astros for Freddy Garcia, Carlos Guillen, and John Halama. While Johnson immediately did well in Houston, the Mariners played better after his departure, going 28-25 after the trade. Like the 1988 Twins, however, the positive play did not lead to an increase in attendance, as the average per game attendance went down after the trade.

Johnson trade

Our next trade is the Bartolo Colon trade in 2002. On June 27, 2002, the Indians shipped Colon and Tim Drew to the Expos for Cliff Lee, Grady Sizemore, Brandon Phillips, and Lee Stevens. The Indians played .467 baseball before the trade and a lesser .447 clip following the deal. Attendance, however, jumped after the trade, up 10.04% over the team’s final 45 games.

colon trade

We look at Cleveland again in 2008, when the Indians moved CC Sabathia to the Milwaukee Brewers for Michael Brantley, Matt LaPorta, and three other players. After trading Sabathia, the Brewers vastly improved their record, finishing the season 44-30. Attendance also went up after the Sabathia trade, from 25,964 to 27,766 per game, an increase of 6.94%.

Sabathia trade

The 2009 season saw the trade of three high profile pitchers. Two were legitimate aces, and the other a former ace that might give us insight to a Rays attendance prediction.

The first major pitcher trade in 2009 again involved the Indians. On July 29th, the Tribe shipped Cliff Lee and Ben Francisco to Philadelphia for Jason Knapp, Carlos Carrasco, Jason Donald and Lou Marson. Unlike the Colon or Sabathia trades, following the Lee trade, the Indians winning percentage and attendance per game both decreased.

Lee trade

Two days after the Indians traded Lee, the San Diego Padres moved right-hander Jake Peavy to the Chicago White Sox for Clayton Richard and three other players. Like the Twins in 1989 and the Mariners in 1998, the Padres played better after moving their ace, finishing the remaining 59 games with a 34-25 record. Unfortunately, also like the ’89 Twins and ’98 Mariners, less fans came out to see their now-winning team.

Peavy trade

Our final pitcher trade of 2009 occurred on August 29th, when the Rays moved former ace Scott Kazmir to the Angels for Sean Rodriguez, Alex Torres, and Matthew Sweeney. Kazmir was no longer the Rays ace in 2009, handling over the title to James Shields and the up-and-coming David Price. But Kazmir still had name value in the Tampa Bay area, despite his decreased effectiveness.

After trading Kazmir, the Rays stumbled to a 15-20 finish. They went from being 4.5 games out of the wildcard to finishing 11 games out of the playoffs. Per game attendance following the Kazmir trade also dropped considerably, from 24,169 per game to 19,574 per game. This attendance decrease of 19.01% is the biggest drop of any of our surveyed trades.

Kazmir trade

The next year, two of our most frequent subjects collided when the Mariners traded Cliff Lee. After signing with Seattle in the offseason, Lee was sent to the Rangers for the stretch run. After the trade, the Mariners, who had played .400 baseball prior to trading Lee, finished the season with a .350 winning percentage and saw attendance drop 4.99% over the last 39 home games.

Lee trade 2010

In 2012, the Brewers were on the dealing side when they sent Zack Grienke to the Angels for Jean Segura and two other players. While the Brewers were 10 games under .500 before the trade, they reversed fortune after the deal, going 39-25, a .609 clip. Attendance also increased after moving Grienke, albeit by 124 fans per game, or only 0.3%.

Grienke trade

In our final trade, we look at the Chicago Cubs. Prior to trading Matt Garza on July 22, 2013, the Cubs were 10 games under .500 and averaging exactly 33,000 fans per game. After trading Garza, the Cubs dropped to 30 games under .500 and lost 919 fans per game in the seats, a 2.78% decrease.

There are many other trades and fanbases I could have looked at (the Ubaldo Jimmenez trade in 2011 comes to mind), but this small sample set gives a wide spectrum of possible outcomes resulting from trading an ace pitcher. From what we looked at, we found:

  • 50% of the data set decreased in both record and attendance
  • 25% increased in record and decreased in attendance
  • 16% increased in both record and attendance after trading their ace
  • 8% decreased in record but increased in attendance

attendance graph

The Indians are particularly interesting, seeing a different outcomes each time they traded an ace. The Mariners saw an attendance drop after both the Langston and Johnson trades but played better after trading Johnson and worse after moving Langston. Perhaps Langston had a bigger effect on the team in 1989 than Johnson did in 1998.

So what would happen if the Rays traded David Price? Given their current winning streak and the attendance sensitivity seen after the Kazmir trade, my initial estimate would have them in the same category as the 1989 Twins, 2009 Padres, and 1998 Mariners – an improved winning percentages but lower attendance. An better record post-trade might not be difficult considering the beginning of the Rays season was a disaster marred by injured players who are slowly returning (Alex Cobb, Jeremy Hellickson, David DeJesus, and possibly Wil Myers).

But with the Rays struggling to fill seats, moving fan favorite David Price might be a bad public relations move. From the studies I have done, games David Price has pitched in have drawn 6% more than average. That could be because Joe Maddon sometimes aligns the rotation so Price faces prime opponents such as the Yankees and Red Sox, teams that traditionally draw well at Tropicana Field. But some of Price’s “bump” could be the allure of seeing one of the best pitchers in the American League.

My estimate is the Rays would suffer an initial attendance drop if they traded David Price. Games against the Red Sox and Yankees (especially Jeter’s last series in Tampa Bay) will continue to do well. Bobbleheads and other promotions will also do well (expect a good turnout for the Don Zimmer sno-globe). And if the team plays well enough to contend, attendance may recover, but even then, the Rays won’t average over 20,000 per game.

Then again, doubtful they would draw 20K on average even with David Price in the rotation.