The rarest colors around here now seem to be white, black, and red. The only white and black I have seen are owned by two friends of mine, and I've never seen a red one. When I purchased mine, it seemed to be the only Platinum in the area. Now I see quite a few.
However, there are simply dozens and dozens of WRB sedans in the Denver area. I don't like to generalize, but every one I've seen has been driven by a young (late teens, early twenties) male, and they never acknowledge me if I wave.
I have not yet properly raced any other WRXes, although I had a brief skirmish with RockyWRX once.