1. There is a high correlation between avg scores and financial consideration (i.e. you generally get what you pay for). As such, it is no surprise that mediocre reviews continue to get business, as there are a variety of budget levels out there. Similarly, there is not a set of scores that alone will have you pull the trigger - it is always evaluated in terms of the price point. I do think girls are too focused on their scores. The problem is if you are really an "8", but manufacture scores closer to "10", you are just creating a situation that is unsustainable - you are going to create disappointment and unmet expectations in future dates. Realistic/honest scores help hobbyists make better decisions - keeping everyone happy. You might not make as much in the short-term, but I think it will be a much better situation in the long-term.
2. I don't think anyone takes the scores at face value. First and most importantly YMMV. This is across individuals and even same individual on different days. Second, there are a lot of factors that influence scores, including knowing provider will see review, not wanting to hurt her livelihood, hoping she will be a reference, or not wanting to be blackballed. There is no doubt that the average scores would be (much) lower if providers did not have access. The "looks" score is more important to me than the performance score, because I think looks is less subjective. I have seen guys ding girls because they don't deep french kiss enough, give covered blow job, won't rim them, or other things that may or may not be a big deal to the next hobbyist. Similarly, because of various scoring rules on TER, some girls are not even eligible for a score above 7 despite being fabulous at what they do.
3. The content in the reviews matters more to me than her performance score. With experience, you can get a lot better at reading between the lines. I have found back-channeling to be very helpful when unclear.
4. There seems to be a surprising amount of bashing about writing reviews presumably for free access, but that is why we are all here - to make better informed decisions. This site has helped me significantly in terms of identifying girls I want to be with. Without people taking the time to write reviews, we would be in the dark. Thus, I take the time to write respectful reviews that hopefully help others to make better decisions as well