Well, this is some important research:

From 1984 to 2009, “attendance was more than four times more sensitive to beer prices than to winning or losing.” That sensitivity is evident at the concession stand. A beer at Wrigley Field, Scorecasting reports, costs just $5, cheaper than everywhere except at Arizona Diamondbacks and Pittsburgh Pirates games.

Tickets to Cubs games, on the other hand, have followed a different trajectory. Since 1990, prices have increased 67 percent (the league average is 44.7 percent). Only the New York Yankees and the Boston Red Sox command more.