I think the product category thing is most likely. They already do a form of {product_category}.amazon, except in reverse: amazon.{product_category}. See: http

I think the product category thing is most likely. They already do a form of {product_category}.amazon, except in reverse: amazon.{product_category}. See: http://amazon.party/ http://amazon.party/ (party supplies) http://amazon.dog/ http://amazon.dog/ (pet food, toys, etc.) http://amazon.bible/ http://amazon.bible/ (bibles) http://amazon.fail/ http://amazon.fail/ (support contact page) and my favorite: http://amazon.horse/ http://amazon.horse/ (directly to the product page for a horse mask)