I too can understand why they would want:
(a) a fixed space, rather than moving from one room to another all the time
(b) their own space, without emblems of other religions, for example.
As an undergrad, I went to a university that had a very large Baptist church on the premises, which other religious groups were allowed to use. But I really appreciated the fact that they had also allowed the creation of a small Catholic chapel on campus for the Catholic students, with a crucifix, altar, tabernacle and everything. Sure, we could have had Mass elsewhere, but it was nice to have our own space.