Just to clarify, are you talking about product reviews or seller feedbacks?
It depends on the product just how many reviews it gets and how aggressive the company/brand is with Amazon’s assistance to get the review numbers up. I just got a product in the mail to review through the Amazon Vine program. It already has 234 reviews. To know the actual percentage of how many are sold as compared to reviews would be rather difficult although the item itself is a top product here. I always see more reviews for the most part on Amazon than any other selling site, which is why I asked for the clarification of were you talking product reviews or seller feedback. I get more feedback elsewhere than I do here. I only have a feedback percentage of not quite 2% here. On eCRATER my feedback percentage is a little over 13% and that has gone down in the last year.