kkl230, good point.
I think it's the combination of both.
CC is a gathering place for I-want-to-go-to-great-college kids.
If you look at this NYU forum, it's filled with those who want to go to Stern and Gallatin, and there's not much Steinhardt or CAS people. (though I applied to CAS only lawl)
Also, if you look at many other colleges' decisions threads, there are only handful of people who post their rejection posts. People don't want to be publicly embarrassed