As I said, when I met her, she already worked as bar tender. Her job was to do the accounting and to entertain the guests and to have them spend money for drinks. All money goes to the bar tender first, the girls don't accept money. If you want to spend half an hour with one of the girls in a private room, you pay DM 300 to the bar tender immediately, unless they know you, in which case you can pay when you leave. After the bar has closed, the bar tender pays out the women.
Every drink is accounted for accurately.
Inspite of that, the owner of the bar was cheated on constantly. For example, the second Piccolo you order for a woman contains nothing but water, but the guest pays full price. The water bottles don't appear in the accounting, of course, i.e. the woman gets the whole DM 40 and doesn't have to share with the owner. With correct accounting, the woman gets DM 50 from this. Maybe she has about 4 guests, so she'll make DM 200 per night on conversation alone.