This feedback system opens up buyers to a variety of new attacks. Someone scraping the site will be able to reconstruct buyer purchase histories. Imagine a pseudonymous buyer with 10 purchases and $500 spent. A few days later there's a review on a $50 product from someone with 11 purchases and $550 spent. A week later on a product that costs $125 there's a review from someone with 12 purchases and $675 spent. User age (conveniently specified to the day) will further confirm this is the same person. So what? You say. Nobody knows who it is. Then the attacker turns to the forum and looks for reviews on those products, during the same time periods. Stylometry (the use of specific adjectives, punctuation, etc.) will help link the forum user to the pseudonymous buyer. The attacker can employ a variety of social engineering tactics, now that he has a target with a verifiable purchasing history. He befriends the target, tells him he wants to start vending <target's favorite drug> and would like to test the waters with a custom listing for the target. Now he has an address that can be physically linked to the target. If you have high stats, you should not be participating in this. If you have $50,000 in purchases over a year and you think LE doesn't care about you because you are a "buyer" and not a "vendor", you will eventually find yourself inside a jail cell. It's unfortunate, because someone in the SR administration once told me that "obscurity is security". They seem to have forgotten that.