I see the logic, but I am curious about the math. The longer session brings with it a higher session fee, so they should be paid more for a longer session irrespective of tips, presuming they get a percentage of the house fee. If they do not get a higher portion of the house fee, then that is the issue to me. The house or mamasan or whoever decides that would be sticking the girls with an unreasonable and inequitable split. Restaurant servers are a good comparison because I'd bet most massage girls make more than most servers, likely for less work, and I'm sure my 20-something server trying to pay off her crushing debt would enjoy watching movies in between tables the way some of the massage girls seem to be doing between clients. If you as a client want to tip them more for a longer session, or for any reason at all, you're a mensch, but I don't think that necessarily means people who want to tip the standard are shorting these girls. Big picture I think both compensation structures are friendly to the employers, and not so friendly for the employees or the customers.