I've been past the arena before a Phoenix Mercury game . I saw a couple hundred lesbians and a few middle school girls basketball teams with their coaches going in. The claim that 10,000+ people are attending an average Mercury game is beyond absurd. The Suns have trouble drawing that many, lately. :)
They don't use the upper level seats, to make the press photos look better. I won't post any because they are mostly copyrighted, but a quick search will show you at least some of the shots of the half-empty arenas.