Stick to what you find best Dave.
You will go bonkers if you listen to everybody. You can't please everybody.
I am not sure if all performers realise how hard it is to balance the books, satisfy the audience, look after the performers, promote, admin etc, etc all for nothing (not complaining).
I have a list as long as your arm for 2007 and all within the budget I can afford, and like you I charge £3 entrance.
I don't know how much advice I get from so many people, I would go balmy if I kept on knee jerking, just becuase somebody else thinks it should be done another way.
My club works fine the way it is. I get good audiences with a limit of 70 including the performers (of which there are generally 10 people making up the performers). It averages 50 overall. It runs every other Friday.
What I do listen to is constructive critism about the club and wherever possible try to change accordingly.
I try my very best to look after all performers who grace my club and really can't do much more than that. At the end of the day, I also have to get an audience to come along and listen. They have to trust my judgement.