>nobody cares that there are very-few/no male prostitutes
Prostitution is very common in the gay and especially trans-gendered community. It may just take a different flavour of prostitution and a different sense of power balance.
Prostitution and stripping can be very lucrative professions.
Just like nobody cares that there are very-few/no male prostitutes or strippers.
The underclass you speak of is split along gender lines too - unfortunately.