You asked two different questions. UL can charge students at the gates to enter athletic events. It would not be the intelligent way to go. It would reduce the number of students attending athletic events and would not be worth the limited revenue.
The other question of "tacking on" a per student per semester... is the tuition increase we are talking about. That used to be impossible for UL. It is now possible based on a vote of the student body at UL. The dilemma we are in is that everyone is trying to figure out ways to cover budget shortfalls and the idea of adding a student fee is unattractive.
I would not ever present a student fee for athletics without tying it to a specific mission and a potential cost reimbursement feature to particular students. For instance, RCAF could agree that for every home game, all students in attendance, will go into a lottery where 100 of those students will be reimbursed their athletic fee. Another separate reimbursement might be an achievement based initiative. Participating corporate sponsors could be solicited, through RCAF, to reimburse students that achieve a specific semester GPA, that also provide proof they attended x number of athletic events. Regardless of my theoretical proposition, there are very workable solutions for making an athletic fee not only pass but also be less painful and very rewarding for our students.
This is a major university after all. We should have within our ranks more people with great business sense and solid marketing skills.