Technically men are also extremely fussy over sexual partners, its not a slam dunk to be a female, um, non-sexual, um, "companion".
Besides, if you want to pay a man for time and companionship, just go to the hospital and see a psych.
With the exception of schizophrenia, there is no mental illness, so basically your just paying for a friend, similar to a guy who would pay, sometimes, just to talk to a hot women doctor.