What is Google Nexus 7's Business Model?
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More realistically, Amazon quickly realized that the tablet is largely a consumption device for high margin content. The lack of a keyboard and touch, along with other design differences, makes the tablet relevant for consumption. Also, Amazon wouldn't have built a closed app and content store system if they thought that physical goods would be the bulk of the business case.
The Fire is part of Amazon's push to ensure that as virtual content sales explode, they get the bulk of the pie.
This is exactly why Google has built the Nexus 7 - to get on the bandwagon for virtual content. If they sell a lot of Nexus 7s - they will definitely be upping their content portfolio on Play.
I believe Nexus 7 is intentionally designed to be too small to leave room for Android tablet partners to innovate. In all likelihood, it will be yet another successful failure by Google - by provoking partners and rivals to sufficiently respond to the Nexus 7, in terms of price and freedom (as opposed to the Kindle) so much that it makes Nexus 7 irrelevant.
Also keep in mind that there -is- a margin for ASUS. Google's reference devices have always been a split where the OEM gets the hardware profit and Google controls the entire experience. The Nexus 7 follows the exact same model all of their previous efforts have.
Amazon has sustainable advantages in a shitty business (retailing/warehousing/shipping physical goods) but when it comes to digital media, it's just bits, a commodity. It is much easier for Google to sell digital content than it is for Amazon to monetize web browsing and email, which is what most people do with tablets.
If this is true, than Google has the stronger position, as they can afford deeper subsidies on the device through advertising. I don't know what Google pays to be the default search engine on the Fire or the iPhone, but it is significant.