Since none of the e-book manufactures tell us what their cost of manufacturing or gross profit per unit is, this is all speculation - not fact but a kind of trolling. There are many reasons a company may pull a product from development or profitable items from sale. How do we know, for example, that Amazons gross on each Kindle isn't 3000%. Don't think that's an absurd number because grosses much higher than that exist in some industries. We can do all the figuring or expected costs we want however, we just don't know what a manufactures costs really are and what deals they have cut.
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