The club/band relationship is a two-way street; unfortunatley, some club owners don't realize this. If a club has a reputation of treating it's bands poorly, it will eventually have trouble booking acts. I've seen it happen plently of times; usually the owner will soon realize where the bear **** in the buckwheat, so to speak. Depending on how many bands are in the scene and how many are willing to slit their own throats, it doesn't always work that way.
Before I joined my current band, they played at this bar in which you had to submit an invoice a week before your performance; it would go to the corporate office and then you would recieve a check a week after the show. (I know, that's a very strange way to do business, but this was some sort of hotel bar, like a Days Inn or something) The band was contracted to play a Halloween show. Without the band's knowledge, the bar hired an opening act. (Around here, it's general practice for the headlining band to arrange an opening act if they desire to use one) Both of the bands played. Our singer stopped in the bar after the date on which the check was suppose to arrive. He was informed that the bar was using another method of mail delivery, and the check would take longer than expected to get there. Our singer called on the date in which the check was suppose to be there; all he got were mail loops and voice mail; none of which were returned, mind you. The next day, the manager called our singer, and said that there was no invoice. He resubmitted it. A few days later, the bar called our singer again, and told him that they weren't paying the full amount, because "the band didn't play the whole night". (keep in mind, the bar booked the opening band, my band had nothing to do with that) They also decided to cancel the show that my band was booked to play that weekend. (Isn't that nice.

) The band was never paid. After not being paid, and having to pay out-of-pocket expenses for the soundman, they lost over 1000 dollars.
That bar couldn't book a band right now, if their lives depended on it.