Re: the ticketmaster discussion. I a previous job I did some work with them. People use them for way more than tickets and typically, the tickets (or donations tied to tickets) are the only place that ticketmaster fees are assessed.
Part of the ticketmaster contracts organizations have is also the software for mass emails (so that's why a lot of SU's emails are sent through ticketmaster) or using their software for credit card information. I can't speak to this exact situation or SU's contract, but to me it would make sense for them to use those two products and I'd be VERY surprised if Ticketmaster took a cut of this (beyond maybe the credit card fee). Think the donation they may take a cut of is the one tied to your ticket (if youre a season ticket holder, whether you know it or not, your ticket price is part 'donation' and part 'ticket' baked into the price. Why? I'm not sure, would assume some accounting reason).