Honest to God I don't mean this to sound as negative as it probably does, but NO, NO, NO don't do this...

Years ago I played a club in Pittsburgh called the Decade for a very similar arrangement and got soaked...If you do this method, you must have a person from your point of view that will counts heads as they walk in. STILL, if the club disputes your person's count-you have problems...

Even with a contract, its a hard thing to pull off.

Good luck...

Bill in Dayton