Buyer communities on Ebay

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I buy lots of stuff on ebay. I like the convenience they offer and find their prices are very competitive. I can judge the reliability of the seller thanks to the fact that ebay allows buyers to rate sellers. However , I wonder why ebay does not allow users to comment and provide feedback about the products they buy, like amazon does.

This would be a very useful service to prospective buyers, because I could learn a lot more about the product ( and alternative options) at the "point of purchase" !