TB -- no different from home
In reality, what you described in SS is no different than at home, where the girl tell you she will meet you at such and such time, never shows, and never calls. The one I had at Kiss Fresh gave me her email and phone, I tried twice to email and no response. What you say is absolutely true, they are there to milk you for what you have, but do not forget, they always, at least in my experience, have a least 1 kid, sometimes more, who spends the whole day with mama, and mama is not happy if she now has to babysit the kid(s) all night as well.
I have this problem with my Colombian novia, she has a 10 yr old, and mama is laying down the law. So, I think the best approach is to go to these places, then walk out after you have had your fun, and forget about it. Remember, we do not pay them to stay, we pay them to go away!!