Personally I can't really see these topping the SERPS without some major plugging
In G's eyes it offers nothing of value - they are nice little sites, but with same photos, descriptions and titles as Amazon themselves, I just can't see how G will not see these as just a duplicate of the Amazon site - I.e no value to the visitor
If you can promote these and get traffic from outside the search engines, I would think they have been built for conversions so you may do quite well