I live in St. Paul and agree that you don't see a ton of Currys around here, but they are around... just a lot more sparsely distributed. Only see a handful of guys in leagues that I play in and the youth rocking them, but it doesn't bother me at all. In fact it's kind of nice
To answer your question -- I think the people that are buying these fall primarily into two categories (I'm not claiming this is the truth, just how I am guessing...):
1. Fans of Curry, young and old
2. People who understand that UA makes solid basketball shoes and that Nike isn't everything