I have read and re-read your post, and do take issue with a couple of things, and agree wholeheartedly with you on another.
Regarding a mentioned respected reviewer not handing out 10's to many of the women he sees does not tell me he has unrealistic standards that are too difficult for a lady to reach, it tells me he has not had 70 "Once in a lifetime" experiences in the past 3 years, which I highly respect. I've seen reviews by another reviewer with, I would guess, more than 20 reviews. EVERY provider he ranked got a 10 in performance, with numbers ranging from 6-10 in appearance. Is he that lucky, or is just meeting with him good enough to earn a 10?
I believe a once in a lifetime experience is just that, a take your breath away experience that hit you on all levels leaving you physically exhausted, emotionally fulfilled, and wondering how you can get this girl to marry you. I don't believe it is just how many times you pop in an hour, or how good her acting was to make you believe she really liked you. Can more than one girl earn a 10 from you, sure! Can every girl earn a 10? I would tend to suspect the reviewers criteria...However, YMMV...
You make a good point in saying you only see girls with mostly 9's and 10's, and that a single 6x6 review won't dissuade you. However, you say you only write a review when a girl earns those marks in your books, and have over 30(?) girls that didn't meet those marks, so you didn't review them. You say are concerned about hurting their business, but I think you miss the point of why TER is here. Ladies can advertise here, but this is a review forum for hobbyist to make informed decisions about whom they choose to give their hard earned money to.
Ladies participate here knowing full well knowing this, and should be ready to accept the chance of the occasional less than stellar or even poor review. Would you trust Consumer Reports if they only posted the good reviews? How do you know what to compare it against? Why would you trust their reviews beyond being an advertising point for the products they review? Those are the same questions I ask myself when reading a reviewers past reviews. Is his motivation to make sure he can get future dates in the future because he's an easy 10?
Only posting good reviews artificially inflates a girls reputation, and also doesn't give her the chance to find out what, if anything, she did wrong so that she can improve her performance and make sure she always gets high marks.
Ms AZVictoria is a prime example, she took the initiative to find out why she got 6's on her review, and was ready to make changes in case it was something she did. What if she only received artificially high marks because hobbyists felt obligated, since that's all she's received? Complacency can lead to bad habits by thinking that even when your not trying, you're doing spectacular. Now a respected, honest reviewer comes in and receives less than stellar performance and gives a scathingly honest review. Then all those who received a mediocre experience feel more comfortable posting their reviews, and suddenly she is seen as an average provider. A little extreme on the example, I know, but it's to help make a point.
Now to the point I really agree with you on, review the reviewer. Yes, by all means, but don't just go by his pattern of scores, that will not give you the whole picture of who he is and how compatible your tastes are. Does he rate a girl 7 in looks, while all others give her a 10? Is it because he expects Adriana Lima to open the door, or because his tastes run different? Does his juicies state "Wow, she's really pretty, but a lot skinnier than in the pics, the ribcage wasn't doing it for me", and other reviewers were saying "Oh my, I loved watching her joints as she walked...". If you're a guy who likes a little meat on the bone, you may agree with him, or, if you're more inclined to the Mary Kate/Ashley look, you'll appreciate the other reviewers' opinion more.
I hope I have not come across as attacking or belittling, as that was not my intention posting this. If you take it that way, I do apologize. This is the internet, and typed words posted as a comment on a message board cannot convey the same spirit when they are spoken face to face in a conversation. I do have to say that I will have to take reading your reviews with a grain of salt now that I know your motivations for posting them.