Anal is getting expensive these days (anyone would think they don't like it
)
Bang on TK, there a few girls in or around Glasgow who take it up the back pipe charging around £100-£150ph, and no extra. That's fair value.
Anything else is a complete rip off

so I reckon you're right - prossies make it too expensive so punters don't go there unless A) they're desperate for an ass shag; B) they have more money than sense; C) they have just won the lottery or D) all of the above.