[DonCJ]

I'm unfamiliar with what a shifu might be, but, I can tell you why professional submissives are so rare.

It's because all over the world, male Tops have no more trouble finding willing sweet young things to spank than do female Mistresses. Therefore they have no need to pay for it.

The inescapable conclusion is that a clueless wannabe male Top who can't get female supplicants on his own hook, is rather the last sort of dangerous incompetent that any pro sub in her right mind would want to be alone in a room with.