Given that the ladies have their own site for rating their customers, I think it stands to reason that some users may hold back harsh reviews for fear of being turned down for future appointments or concern about doing harm to a provider's business.

I don't write a review for everyone I see, partly because I was brought up on the principle that if I couldn't say something nice, I shoudn't say anything at all. I've had a couple of experiences where the provider was good looking and provided the agreed upon service, but there was just no chemistry between the two of us. In those situations I've chosen not to write a review because I wanted to stay in the good graces of the local provider community. I also didn't want to hurt her business because we just didn't click or she was having an off day.

I would not hesitate to write a negative review on someone who had truly ripped me off but, knock on wood, I've not yet had one of those experiences. When I have a lukewarm experience with an otherwise well-reviewed provider, I tend to just chalk it up to YMMV and personal chemistry and let it go without writing a review.

I think most do not admit the bad times and no reviews are submitted.

That is why we have this forum (at least one reason).  That way we can prevent having a bad time.  To me it is the time not the $ that makes it critical to do the research and make sure you have made a good decision.  The more time you can spend in upfront research the better your experience you will likely have.  

Now that does not mean that you can not find what you are looking for without out research.  If you take enough attempts you are bound to stumble into something that works.  

Every lady I've met has been a gem. Sure, some have kept in touch and other's haven't, and some were more "professional" while others were more personable, but in every single case I had a great time and got what I felt was my money's worth (or better).

The toughest part for me has been getting away from a meeting without becoming "smitten" — I've come perilously close more than I care to admit.

Doing your homework ahead of time,and being rewarded!