So, why do we keep striking out on white players, too? Parsons, Kanter, and Hedo come to mind immediately.
I can buy the east coast thing somewhat, but your second point is the bigger key as far as I'm concerned, and part of what I was hinting at previously. Portland fans love to pat their own backs over being the best fans in the league, but it's not really a great fan base to play for. Rabid, but way too emotional. Roy wasn't even turned on while he was here, and he never really expressed any love for the city.
Until you can admit that Portland sucks, you'll never understand why it isn't a draw to free agents.