I've heard that the Orthodox in general (or maybe the Russian Orthodox in particular) are one of America's wealthiest relogious groups.
(Coincidentally I happen to be in SF atm and hung out w/ an Orthodox friend getting a biochem PhD)
I think the Greeks tend to be wealthier than the Russians, but in terms of wealth it is relevant that the Bay Area (which it goes without saying is very expensive) is a historical nexus of Russian Orthodox presence, with six churches being located in San Francisco alone. There's also a huge number of churches in the Northeast. Orthodoxy is just starting to branch out into rural America and find converts among segments of the population that are less well-to-do.
Incidentally, if you haven't done so yet I strongly recommend you visit Holy Virgin Cathedral.
I know a minimal bit about Russian migration to the West Coast--St John of Shang-Hai and San Francisco and such--and I've visited Brighton Beach (which looked substantially more working-class than the Russian/post-Russian areas of SF I've seen), though didn't look at any (non-Catholic) churches in NYC.
As for Holy Virgin, I might go to church with said Orthodox friend next Sunday in SF, though we had discussed the aforementioned St John instead. Checking the map this morning though, I didn't realize how far away it is... so Holy Virgin might be on the list! I'm actually about an hour's walk from it right now.