to Dpo: you are correct. a donation (or "donation") is technically not required to be a season-ticket holder. but, as I understand it, the donation is required for the better seats and seating areas.
I would personally say that is not a donation as I define the word. If I want to sit in a better seating area - maybe an area where my family has sat for years, then the donation is required to keep those seats. As I use the word, a donation would be 100% optional. Here - it is more like a form of blackmail - "want good seats - give us a donation. No donation - go sit in the cheap seats."
Look, I understand that donations, or fees, or blackmail - whatever you want to call it - is SOP for most college FB programs. No different than the Vikes with their "personal seat licenses." I understand it - that doesn't mean I have to agree with it.
Don't want to beat a dead horse, but Teague screwed the pooch by jacking up the donation as much as he did, and as quickly as he did. a more gradual, phased increase would have been a lot more palatable to fans.