According to their website you are correct as far as its use restriction.  Couldn't find a budget item for staff or operating costs.  

"Building Uses

The first floor of the building is open to the public with a cafe, auditorium, atrium for public events and an academic hall of fame to recognize past, present and future student athletes at the University of Oregon. The two floors above are for the exclusive use of Oregon's student athletes and staff. The facility includes a 114-seat auditorium, 35 tutor rooms, 25 faculty/advising offices, conference room, flexible classroom, computer lab with 54 computers, graphics lab, 3 teaching labs, library, student lounge, tutor lounge, staff lounge and study carrels for all freshmen in Frosh Hall."

Maybe the restriction was put in place when Phil Knight paid for it?