I have not been able to confirm this, but Peter Gammons of ESPN has said a couple of times, via TV and web, that the Rockies attendance numbers are down this year from last year, and he seemed pretty bummed about that.
What do you think the correlation is to those numbers? bad team last year = less attendance this year? Economy? The fans have come out for big games/series lately, but maybe that just drives the point that they are not going to see the Rox, and that's disappointing.