Personally I hate the entire concept of "enhanced" books. I don't want my paper books singing to me! I even get irritated with musical birthday cards!
How much bigger would each book file be with unessesary audio or video files? A normal epub generally isn't much bigger than 2-3 MB. You start adding video and sound files into the mix, and all of a sudden you could be looking at a 200+ MB book.
In addition to the size of the files, I would imagine that battery life would be severely affected by playing sounds and video instead of straight text.
Not for me, thanks!
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