Remember to that nobody is selling PDFs really. If you can't buy the pdf file through apple or others, customers don't want it, plus with fixed-layout you can choose the viewport size so you can accomodate different devices, unless you are on a computer or a tablet, it stinks to read a pdf on say the iphone or any other phone, it's pinching and zooming and scrolling around. ePub3 and the advances with that will help ePub take on more of a app like feel for an eBook. PDF is nice, not really an eBook, but is highly used by the ed market a lot.
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