I have not ridden in the places you mentioned, so I can't say for sure, but there might be an alternative logical explanation: the youngsters that fide FG on the campus are students who also live in the dorms and student apartments in and near the campus. The older guys like me, who have a job at the campus but also a family and a flat or a house of their own away from the campus, don't ride fixies (it's a "youthy" thing ATM).

Maybe I just suck - but that's OK, I'm happy