If I were in charge of the entertainment department, I would check the total sales of adult beverages and base their pay on that. High sales - higher pay. Low sales - lower pay.
I was at Spanish Springs Town Square a few times when entertainers were encouraging people to buy drinks. So it leads me to believe that beverage sales may be used as a gauge.
Note: I don't mind "wasting time and effort" on this thread because I'm retired.

....