If you don't mind me asking, why Volleyball? Did he play, did his sister or your mom play? Don't get me wrong, I think it's great he does, but that's not a typical sport you would donate to.
He donates to both the Iowa State Foundation and to the athletic department. Not sure why he donates "extra" to be designated to volleyball--they have only had season tickets for a few years now (he has had wrestling season tickets for 30 years, football for 20, WBB for 15 or so, MBB for 5 years). I think he is trying to be the Sukup of the volleyball program.
I was the only one to really play volleyball and I was mediocre at best (still on JV my junior year). I like playing, I am just not that great at playing.