We have a smoking ban in all clubs in Queensland, Australia and this invariablymeans half the patrons are outside puffing up at any given time. A busy night for me is a 20 singer rotation, a quiet night is six or seven. It's a catch 22 situation really. If you have a small number of singers, it can get rather monotonous and if the numbers don't grow significatly during the night, it can mean an early night for me. On the other hand, if you have more than a 20 singer rotation, it can lead to a wait of in excess of 75 minutes for a song which can lead to frustration for some and the serious singers will sometimes leave rather than wait that long.
Sometimes you can't win.
Lloyd T