I am an Iron Duke and only am able to donate the minimum. The membership gives you a little priority in purchasing football and women's basketball tickets. The Iron Dukes will send you a ticket application for some of the games in which the students are on break and your ability to purchase these are based on a priority code. I have been listed on the ticket exchange for several years but I think there is a small window of exchanges.
Even though $100 doesn't seem like much, if every fan contributed, collectively we'd make a difference.