Bars are the worst. Unfortunately, they're also the largest market if you're shopping gigs. A lot of folks will tell you (me included, on certain days) that you shouldn't play for less than you think you're worth. But when that rubs up against a thin wallet, and playing for crap vs. staying at home for nothing, that $100 looks pretty good. But it's not. In my experience, musicians are pretty close-mouthed about what they're making at given venues. I don't know if it's from habit, perceived ethics, or embarrassment, but I think it works against us rather than for us.