Actually it is roughly $3000 for a venue up to 3800 square feet for the licenses from ASCAP, BMI and SESEC, payable per year. If they have one band a month, that's $250 per performance. Get a band a week and you're down to $57 per performance, but no matter what the number of bands, the fees have to be paid yearly and in advance.
little venues can't afford bands once a week, BANDS LOSE MONEY for little venues. Trust me I know.