depends on how many people read the review
I don't know what proportion of the punting population read this site
some of the keyboard warriors on here seem to think UKP is hugely influential, but I doubt it
But I've read some SAAFE threads talking about escorts getting a negative review and the view seemed to be it didn't effect their business
I think if a girl is getting good reviews, she'll also be getting good AW feedback, and repeat business
so she gets busy and puts her prices up
but that may not be effected by reviews on here
Most certainly most punters wont be reading UKP, either they don't know about it or aren't interested in it in my unprovable view, otherwise there would be even more members of UKP.
With some forum darlings who have been members on UKP or UKE they have said good reviews on here did directly help them get more business, and some of them put their prices up to cash in while they could, this also often had the effect of it becoming much harder to get a booking with such WGs, something I have experienced myself on here and another punting forum some years ago. So there IS a correlation but probably only for a small number of forum darlings.
WGs getting bad reviews on here might not make much difference to how many punters they get though simply because of what I said earlier, in my unprovable view most punters don't know about or aren't interested in UKP.
As UKP grows so will its influence hopefully, time will tell on that obviously.