Let's figure that you and most of us write a review most of the times we make a visit.  Even if it is only half of the times, it is going to be a far higher proportion than the number of reviews per visit for each provider, who is not in control of the writing.  If that proportion  is, say, one in ten, then 500 reviews represents 5,000 sessions.  (I have a feeling the proportion is lower and the number correspondingly higher.)

So you are absolutely right that most providers surely have been laid more than you have reviewed.  

My perspective is (Dare I say it?) a feminist one.  I find it odd that it is a great thing for a guy to amass 300 reviews.  I find it odd we stay away from even mentioning the high number of reviews some providers have.  It almost seems like it's a "bad" thing for a lady to have a lot of reviews.  It might be unfair of me to impute that here.  

I think it is an amazing thing to have slogged through thousands guys of all varieties to have amassed 477 reviews.  I am kind of in awe of it and think it is one of the most intriguing human interest stories hinted at here on TER.