Apparently nobody has signed up for the dorms at CU in which it is legal for a permit holder to have their gun. Probably one of the following reasons explains it. I'd lean more towards 2 and 3.
1. Nobody is interested
2. Permit carriers are over 21 and not likely to want to live in campus dorms that have younger students.
3. Permit holders don't want to be singled out and be completely conspicuous that they are permit holders which living in that dorm would do.
'Gun Dorms' At University Of Colorado Do Not Attract Any Students