Not enough truly hot girls.
This is a big reason. Most of the truly hot girls do seekingarrangement or something else now and that is not likely to change. Guys have a hard time understanding how warped or desperate a woman has to be to work at a spa. Yes all women like money and many will sell themselves in some way to get it. But working at a spa means having intimate contact with endless lines of random strangers most of whom these girls would not even want to sit next to on a subway. It is also a health hazard. Spas are no longer a first choice for top workers or clients just like strip clubs no longer are.