I consider it not worth the risk or bother to see unreviewed providers. You can't really get info on them. They may be delisted for good reason. On occasion I well see an unreviewed provider. Of the few times I have done it I have not had a problem. However, I spend quite a bit of time following them first. The bulk of the rip offs are going to be hot young looking girls, at least in the photos, we low rates. I have my own criteria for deciding of an unreviewed is legit and few pass the test.
Of the few that did:
One was young but the service was not very good so her first review was a 3 rating from me on performance.
The next was in her mid 30's, was a bit average in looks but very good on performance. I didn't review her either and can't currently review her because she advertises on a site TER does not currently allow.
A third was also older, pissed me off at first because she kept me waiting an hour after the agreed time. But she made up for it my knocking off part of the donation when she finally got home. Then just as we were to get started, a friend of her's shows up at the house. I'm kept waiting around another 30 minutes while she deals with her friend. However, she made up for it again by having her friend (female hotter than she was and she was attractive) join us at no extra charge. She also advertises on a site I can't currently use for reviews. That was one of my more interesting experiences and to think I almost blew her off and left. Definitely plan on seeing that one again. I just need to make sure I have a few hours extra open to allow for more surprises she can make up for.
So there are some good finds out there. It's just that usually it's not worth the risk and time, IMO. But if you are very careful and good at filtering out the TGTBT it can work.
It can be a catch 22 for new ladies because reviews help their business, but they need business to get reviews. Sometimes if they know other provider who is established that provider will vouch for them with some of her clients to get them jump started. I have only been approached once to do that, and I wanted to, but her location made it very hard to schedule. But if one is legit, you can be patient and wait for her to get reviewed. It should happen eventually