For the 2004-2005 academic year (the last year that the NCAA required reporting of financial numbers to my knowledge) ISU reported football ticket sales revenue of: $6,055,614, and all football revenue (which includes conference distributions, gauranteed neutral site payouts, and concessions) of: $11,456,935.
Total Football expenses were reported at: $7,160,617, so for football only we show a profit of $4,296,318. For the entire athletic department in '05 we had a surplus of around $600K.
This is of course for 04-05. Ticket prices are much higher now as are coach's salary expenses. So it's difficult to extrapolate where we are with revenue and profit for football this year based on those numbers, but I think it's very safe to say that both revenue and expenses are higher than they were 4 years ago. I would conservatively say that we would have an increase in revenue of at least 15% and probably an increase in expendatures of 15-25% based in part on still having to pay out $+500K to Cheezwad's old staff plus the renovations to the stadium getting drawn into that.