According to a study by Team Marketing Report, the Cubs have the highest average ticket price in baseball just ahead of the Boston Red Sox ($52.56 vs $52.32) with the New York Yankees third at $51.83 and the White Sox fourth at $38.65 (I guess shirtless fan attack insurance is expensive). The average ticket price in baseball is $26.79. The Cubs are second in Fan Cost Index (the price of taking a family of four to a game) to the Red Sox ($329.74 vs. $334.71). The Cubs also raised ticket prices by 10.1%, the second highest increase in baseball behind the Twins and their new stadium. The bulk of that increase being due to the addition of 12 platinum games to their tier-pricing schedule. There is no economic crisis for Cubs fans apparently.
While this is unfortunate news for anyone trying to raise their kids as Cubs fans, I don't think it's a coincidence that Boston and the Cubs lead the pack. Two of the more popular teams that play in old stadiums with limited capacity and amenities. Say what you will about the Cubs whoring out Wrigley with things like the Toyota sign, but it's a drop in the bucket to what most stadiums do, especially with their fancy jumbotrons. The economic laws of supply and demand certainly contribute, the Cubs can charge so much because people will pay so much and the cycle continues. Nonetheless, when going to a baseball game takes as much planning and budgeting as a family vacation, it's a sad reality that kids will be limited to their exposure to Wrigley Field as they grow up. Of course, with the typical crowd that seems to now take in a Cubs game, that might not be so bad.
PS - Thanks to Rob Richardson in the comments for the link, but Rob Neyer has his take on this article and explains the Fan Cost Index which includes: 2 adult tickets, 2 kids tickets, 4 soft drinks, 2 beers, 4 hot dogs, 2 programs, Parking and 2 Adult-size caps. So yeah, that's an insanely bogus little metric they've invented.