I've been a season ticket holder since 2002. My butt has been in my seat for almost every home game in that span. My wife goes to about half of the games, the other half I take a friend or family member. We also buy a youth ticket. When my kids and my nephews were younger, they often used that seat. Otherwise, we use it for the extra space or a kid of a friend or I give it to someone if I see a family outside the stadium looking for tickets. Soon, my grandson will be old enough to go with me.
I give $500 to the VC every year, $200 to the school of ed., and buy 2 season tickets to two other sports (usually women's bb and volleyball or baseball). We go to some of those games and give away our tickets for the others to friends or co-workers - often families whose kids play those sports.
I know I'm a small fish but I've been a loyal fish. If I get moved up or over substantially, I will say to hell with season tickets and simply do what I've done with basketball over the years. I will pay a scalper for a good ticket for myself if it's just me, and use stub-hub for a pair of good seats when the wife wants to go. I'll use the $1500 or so that I typically send to IU to pay for better scalped/stub-hub seats. I'll stay home and watch on tv when the weather sucks. I'll park on the street and walk to the stadium (I could use the exercise anyway) rather than buy a parking pass.
I won't bitch and moan but I'll act in my own self-interest - just as the university is doing. And I won't be pissed off looking at the rows full of opposing fans sitting in front of me who pick up resold tickets from the "basketball-only" crowd that donates bigger bucks than I and never darken the entry of Memorial Stadium. I will decide on my selection day whether it's worth it to continue to be a season-ticket holder or not.