Drinks are expensive for a reason. That's basically how the club makes most of their profit.
A liquor license is expensive as fukk, then you got rent, utilities, payroll, and the loan they took out they gotta pay back. Then you gotta maintain and furnish it.
Lastly you gotta pay ot fill that bytch with people. Most use promoters and when they do they splitting or getting a large chunk of the door. You get a big name DJ.. you gotta pay.
Liquor is like the only thing a club can make money with and not worry about outsiders dipping in the pot.