I started out punting punting late 80s. There was a big recession on then. Lots of the streat workers were single mums, layed off nurses, homeless young girls, vulnerable normal people looking to pay their rent.
I don't know why you don't see that now.
Could be intimidation from gangs, could be the low cost margins now, could be lack of privacy now.
In 1990 I was paying 140 for one hour incall, a full weeks wages, and 40 for a quick car shag so don't try to tell me it's more expensive now. There have been a couple of local girls exposed by name in Sunday rags and another great local girl who's real name and details was posted on this very site.