Yep,
Well, the issue is that many long running bands follow the simple economic equation. They "think" the demand is high, so they play out VERY infrequently to drive up their asking price.
Sure - it works for some bands, but not for most.
I think what most bands fail to realize is that metal shows here in the States is NOT a rare occurence. Even if BAND A who hasn't played in 20 years finally comes to the area, they are still competing with 5 other shows that week.