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The thing you need to know about users is that they have no idea these seller reviews exist because they are outside of the product page for the product they are buying. Furthermore, most visitors to Amazon have no idea that their products are being fulfilled by different people and not by Amazon. They think that Amazon has a warehouse for 100% of the products they sell on their site, and these other sellers are non-obvious to the vast majority of users. When they see things related to "sellers" on a product page, they just think that means the manufacturer. They don't get that any scammer can "open a store" on Amazon because Amazon goes to great lengths to make the experience seem like it's all 1 big store. Sure there are weasel words all over the site that point out that Amazon is only an intermediary, but almost no non-technical user understands this. Thus, leaving bad seller feedback anywhere other than the product page allows Amazon to keep scamming users through these 3rd party sellers.