The problem is amazon is not a hardware company; they sell content. So amazon doesn't care about PDF because it doesn't make money on it.
They do have that format of theirs which is a drm wrapper around PDF, so maybe we'll get a better PDF device eventually but for now it doesn't seem like a priority. At any rate, the existing DX is a dead end pretty much.
Mind you, I would love to have a dx myself, but it's too expensive. Prices on eBay have not budged.
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