Surely the great advantage to clubs of being flexible is that they can put on artists that people really want to see, when they want to see them. This will affect your audiences in two rather good ways. First, they will be excited. Secondly, they will be larger. And, as a third bonus, if you book some people who are just becoming good, you might even get a younger audience. Which might be too much of a shock to some clubs, of course (add humorous emoticon).