Adult theatre / bookstore / novelty businesses are a mixed bag. Their ability to remain open, if they allow sexual contact in the business can be severely limited by local issues including law enforcement, codes, zoning restrictions, and so on.
Some of these businesses are targeted by law enforcement. A few have proprietors who have their staff keep an eye open for these visits, and will warn patrons of a pending problem - that may be the case in the visit you describe.
As for patrons, in our experience it's always a roll of the dice - a few times KK and I've gotten lucky and the venue's been full of horny, willing men (and sometimes a few women). Other times, the 'score' is close to zero.