Wouldn't this be violating copyrights left and right? Presumably most of these listings have pictures and I'd be surprised if Amazon were asking permission to reproduce them. Would the same apply to item descriptions...?
So if I buy a thing, take a photo of it, then use my photo to accompany a listing for that thing, the manufacturer of that thing has no recourse in copyright law.
(IAAL, not legal advice.)
Moreover, I'm pretty sure purchasing a product does not give you the rights to use all the marketing materials for that product. Those copyrights are separate.
And the act of listing inherently happens before any purchase.