Its just amazing to watch Amazon and Google go at it like this. Reminds me of the Tymshare business model, they rented out mainframes to lots and lots of companies, basically got all of the OpEx paid for and then they could offer their own services that needed a mainframe for less money because they had a free mainframe :-). As long as the capacity you sell leaves enough capacity on the table for your own use this is a really nice business model.