This is interesting direction in which to take Crowdfunding. Funding by customers (or want-to-be customers, as the case may be) certainly makes a great deal of logical sense. For an intrinsically interesting product, who could represent a more motivated investor base than those who REALLY want to buy the product?
Furthermore, arguably, for ideas with potential legs, the pool of potential investors (and correspondingly, investor dollars) can be much larger than the typical investment-for-investment’s-sake pool.
Certainly the anecdotal evidence presented by the Pebble watch indicates that there is potential in this twist on Crowsourced funding.