In my opinion Burke is the only "old man" which use the "restaurant" services. But he may use his influence to attract sponsors in exchange for other things like advertising or who knows...
Not a chance. He may want to turn them out himself, but there is no chance Quinn is going to make enough money to even bother pimping girls out to college students. Look, the reality is the only way any prostitution business makes any sense is guys in their late 30's to their mid 60's. Those are the people with the disposable income to do it, and the desperate ego to sooth. Give them a way to do it for a tax write-off...I mean...come on. Besides, the whole scheme doesn't make any fucking sense at all, if they aren't turn the girls out.
Quinn's running what, 4 girls, trying for 5-6? Say $350 an hour at the low end (hot college age girls - hah! - more likely $500-1,000 an hour), send em out a couple dates a week...$3-10,000 a week, at the low end...with her money problems? Nah, there's a lot more old men than Burke.