A few differences: 1. Amazon trades on a reputation for outstanding customer service. Not just 'like COSTCO' but mythically fantastic. Without that they are,

A few differences: 1. Amazon trades on a reputation for outstanding customer service. Not just 'like COSTCO' but mythically fantastic. Without that they are, well, Just Another Webstore 2. Returns are an expected cost of doing business online but Amazon seem to be ratcheting the criteria. Already I've stopped buying buy-try items like clothes on Amazon due to punitive return policies 3. Having your Amazon account banned can affect much more than just buying groceries due to their highly-integrated services