Well, yes, I'm sure in Sacrmento there is competition for pro sports dollars.
But, that competition is diluted enough by; number of teams (Raiders or 49ers) and whether they follow it at all. Or, to put it in simpler terms, there's far more DIE HARD Kings fans in Sacramento than there is die hard any other type of fans. Sure, there may be die hard Raiders fans, but not more than the cities ONLY pro sports team, the Kings. The Raiders, 49ers, whomever will never get the equal number of die hard fans.
I'm sure there's plenty of Seahawks fans in Portland. But, there's not more than diehard Blazer fans.
Not sure if that makes sense?