I would guess that one main difference (and it probably has already been stated) between music/cd's and ebooks is that folks did not want to get forced into purchasing whole "albums" and folks like to create their own mixes of single tracks or random tracks.
That is certainly not the case with ebooks - it pretty much is all or nothing unless it is a short-story book or book of essays. There is no discrete $0.99 chapter.
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