Is totally a thing. In my area, there are two places I asked both about this and both were ok with it, three HF and three tips, no problem, but had to be either first of the day or last of the day. My two buddies and I asked for before open or before close, and both places were good to go. No DP, but am sure if we negotiated even that was on the table. Mister Ted DiBiase used to say, everyone has a price! Am sure those crazy places up there in New Yock are much more willing than down here. Also, the reverse GB thing, that seemed rarer, in my experience, at least with Chinese places, they have a barrier about being nude and doing stuff in front of each other.