Interesting concept, but I prefer the "buy the HB or PB and get the digital version for free" concept better. I only mention this because it has already been instituted by Syngress Press with several of their computer series. They could forgo the hard copy and require you to to simply input a special code to download your digital copy.
Of course your method could cut costs if they only have to physically print books when ordered and not bother with back-stock.
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