Except for the fact that Favorites/Bookmarks/Whatever are traditionally intended to remember websites you haven't vivisted before, and of which you think "Hey, I should come back here!"
How are you going to create rules for sites you haven't visited before?
(Yeah I know, your "ebay" example is valid, but I think it's exaggerated. I don't visit sites that don't offer me a decent way to navigate to things I like. (Long live Amazon!))