>>I'm not sure I get you here? Are you saying if people want an act on at your venue you try not to put them on?<<

That depends if it is a campaign or a request.

When people have suggested or requested somebody, I have gone away and done my research. When I was satisfied that the act suited the style of the club, then I would get in touch with the act or agent to see if I could afford them. If I could, i booked them.
I have to say that the variety that appeared at the club was very varied.

However I was never in the league of Cambridge Festival and I have great respect for organisers of festivals. Its their job to decide who they will put on and they stand by their decisions. Cambridge seems pretty succesful to me.