There are decent finds on Vivastreet, but there is a lot of dross
What you have to question is why the Vivastreet profiles are there, rather than AW. Several answers, mainly negative
Posting phone numbers on VS is free, its charged on AW
Vivastreet require no authentication to set up an account, AW require passports and proof of residence
Vivastreet don't mind if you post duplicate profiles
Its easier to set up and administer a group of profiles in VS
VS don't arbitrarily dump profiles
Overall, its a lot easier for a pimp to set up a collection of profiles using fake pictures, no ID and then B&S the girls on VS than it is on AW
If you monitor them after a few months the various pimp/gang groups become obvious - even though they change girls and profiles. Things like profile wording, reused phone numbers, reused photos, identical pricing give them away. Its possible to get to the point where its easy to spot the address on many AW profiles without even asking the girl where she is.....
And FWIW, last time I did a check, Vivastreet listed around 140 profiles for Lancashire, that boiled down to around 110 foreign profiles, about 60 real girls (shows the number of duplicates) in around 20 addresses. Most of those were B&S
AW profiles for foreigners are now insignificant in Lancs - maybe an additional 15 girls in five addresses