Aside from the issues of morality, revulsion of having sex with fat, hairy, ugly old men, and the state of the market, the job must also be very stressful. Problems surrounding the complexities of bookings, having the place in good order with all the accoutrements in place, having to put on a performance all the time, anxiety about difficult and even potentially aggressive clients, having to hide your work from friends and family, inability to develop or sustain ordinary relationships with men outside work, etc. must make this quite a stress inducing job. Not only that but you need to be very well organised to handle all of this, at least if you do it properly. I'm not sure many girls are psychologically up to this, even if they entertain the idea. No wonder many of the very best WGs burn out after a while. No, I'm not surprised that more girls don't do this job.