Many providers change.  
Their performance improves as they are new and get the hang of it. It falls if they get jaded.  

Their appearance changes if they let themselves go or tone up. Or as they age, have surgery, get ill, gain or lose weight, etc

It would be easy to program the attractiveness and performance scores to be a rolling average of the scores on the last ten reviews.  

 In most cases (women who are rarely reviewed or on here for a brief time), this would not make any difference.  
In situations of women with 20 or more reviews, it would give a much more accurate picture.

It might be 10, or some other number.  But anyone who wants to give more weight to the latest N reviews can easily do that... no programming required.

Anyway, a program couldn't easily take into account outlier review scores--unusually high or low. The human brain can do that easily.  It can also consider what's written in the reviews... which IMO is far more useful than the scores

I stopped paying attention to numerical scores right after the Top 100 list came out.

but somehow I have managed to pay even less attention than before those lists came out and made a mockery of the review system.

1) It's redundant.  

In a way, the scores are already on a ten review rolling average because the profile page shows ten at a time. Anyone who's interested in those numbers can quickly scan the column of ten numbers and have a good idea of the average. Not calculated to the hundredths place, obviously, but one can immediately know if those ten scores are "up to their standards". I'd bet the average user never clicks through to page two and beyond. Especially those who are worried about those numbers.

2) It's redundant.  JK!!  

As has been mentioned in the thread already, and as I implied above, those numbers are wildly irrelevant. Largely because the scoring system is a cluster-fuck of a mess. Also because it's just too subjective, person to person. I've learned to totally ignore the performance scores, except for 1's, and just read the reviews. I've read too many reviews where the guy sounds like he had the time of his life but he gave her a 6 or 7. (Yes, she was eligible for a ten.) In another review, the guy sounds pretty meh about the whole thing and grades her a 9 or ten. Hell, I can look back at my own reviews and wish I could change a couple of those numbers based on "well she was better than her, why'd I score them the same?" ETC.  I also ignore the looks scores. For that I rely on "Are the photos real?" and, again, read the reviews.

I think a lot of users are aware of all this and ignore the numbers to some greater or lesser degree. If you're a provider on TER, any prospective client who relies only or even largely on those numbers is probably not someone you should feel too eager to meet.

I've seen a provider get ten new reviews in under two months. Under your proposal, the guy in the 11 spot would feel like his vote didn't count. What is this, the electoral college? We desperately need scoring reform, but I don't think we should make it MORE complicated.

I don't mean to bash your post, and I do understand and even agree with your reasoning. I just think it would lead to more confusion and definitely more review manipulation.