I'm curious if there's any thought given to the opportunity cost for fans buying beer in the stadium vs. donating. For instance, suppose beer were available and a fan spends $30 in the stadium on it, and the athletic department gets $6 in profit from that. But with those numbers, the AD would really prefer if the fan spent $15 on the same amount of beer outside the stadium, donated $10 to the AD, and kept $5 for themselves.
Now that probably shouldn't be used as a reason not to sell alcohol, because I don't think that most people budget or use their money that way. But I'd be curious if there's any negative relationship between something like alcohol or concession sales and donations.