Many of us don't get the logic. I do supply chain management for work. A reputable supplier may decline our audit request or some of the purchase orders. It could be because our volume, product requirements, ordering pattern etc do not fit their target customer profile. So they decided to focus on the customer portfolio they can service the best. That's how a business maintain their competitive advantage.
Ginza has probably seen enough people in and out. By the moment when they mention the charge to new customer or suspected time waster, they are ready that you will talk away. Instead of getting all the girls out, they better leave them along and and show line up to someone with trust mutually. It's a business decision. I don't see any thing wrong.

Other point I want to mention is, many of us compare girls with products like clothes, phones. We remember we are human but forget the girls are. I know a few WLs only do booking and often times stay in the rest room even when they have free time.

Perhaps for those of us walked away if they can report back where they finally ended up to and their better lineup experience, we may have more constructive conversation.