Some info from Chinese forum again.
[QUOTE=Kumbu;2278769]4. Girls had to hit a minimum number of LDs per month, depending on seniority. She was on 50 LDs per month. Again, for each LD they are short, they owe the owner a certain amount. But they made 50 baht for each LD they sell. This of course incentivizes them to stay in the gogo bar to sell more LDs, or to do ST so they can rush back and sell more LDs.[/QUOTE]Just want to add that every club has its own rule. In some clubs, the girl only get paid for the portion that is over the quota. Some clubs will pay girl back half of the LD price.
Some clubs will also pay girl back a small amount for the BF received.