Not to mention 25 of those seats cost you $400,000, which, at $500 per, you will repay your investment in 32 games. Assuming you sell out each game. I think a more reasonable guess would be 15 seats per game which would mean it would take you 53 games to repay. If you play 13 home games a season that is 4 seasons.
This is sort of turning into point out stack's faults but really it is a good exploration into how to manage an economy so don't take offense to this.