When I was a student, back in the ancient days of 2000 when Drew Brees was slinging footballs at will around Ross-Ade Stadium, Purdue did not have an attendance problem. There were 11,000+ students in the stands for every game and multiple sellouts each season. That time paved the way for the most recent round of major improvements such as the Ross-Ade pavilion, the wider concourse, and pretty much everything else. It looked like the good times would never end as an expansion to 80,000 seats with an upper deck seemed possible.
Fast forward 15 years. We have this:
General public football season tickets sold (as of 7/31/2015): 14,314.