also they might be getting repeated business through this "new" client called grouper and then notice some of those people having sec in the bathroom. It's probably more than a one time thing so they realize it's a business and then don't want to get associated with certain kinds of businesses which the law is really hard on. It's illegal to make profit from or take any more from money made from prostitution so it's in their interest to make sure everything ok and they aren't being turned into some poorman's brothel and don't have to worry about the cops shutting them down next week.