Well, but the exciting thing to me is that once the initial kit is build, its a sustainable kit. It can in theory, build anything you want, but it can also rebuild itself. Right now so much of what we buy, we pay inflated prices for, which is justified (partially at least… I have my suspicions) by the need for corporations to invest in R&D. If you have an open system which is sustainable, and you can begin to compete with the closed systems you either drive them out of business, or force them to imitate many aspects of the open model (did anybody notice that the latest update of OSX cost the same amount as a new Linux build (that is to say, it was free).
The other point is that while it does take a significant amount of resources in an absolute sense, it takes WAY less resources than the same broad spectrum of industries and functionality done in a conventional manner, that is through massive corporate centralization.