Apart from the thought of having one night in six or so as a "new talent" night for people who have never performed at the club to try out and get some constructive feedback, I wonder whether there's an opportunity for new technology here.

It may be possible to hook up a cheap digital recorder to the PA and create an MP3 of each performance, which can then be given to the performer - on a USB pen, or via email etc. etc. They feel they are getting something for their money and also have an opportunity to hear what they really sound like!