So true, but I don't think it's impossible to maintain classification, that's just Amazon. I think they just gave up trying to, probably after they opened up up other sellers.
I suspect their search, classification, filters etc are all so broken because it's all based on a Google-style textual search, with no backend database driving those site features.
Pricespy had excellent filters for the produxts they listed, though I guess it was more focused than amazon. I would say maintaining is possible, especially if they let retailers define the fields and responsible for filling them for the products they list.
I suspect their search, classification, filters etc are all so broken because it's all based on a Google-style textual search, with no backend database driving those site features.