I tip generously at spas, but I won't tip a private masseur. I may round up for conveniece let's say from a 180 to 200, but not a tip when they are already charging more than a typical massage rate. I pay 120 for a 60 min massage to a masseur that comes to my place for a legitimate and excellent massage. For a mediocre massage with MT/HE, 200 should be sufficient. Most of the time these are rub and tugs guised as a massage from an untrained masseur. Now, If it goes into full escorting territory, then I go up accordingly.
For the haters: That's just me and you do what you feel comfortable with.