Because it is a LOT of work. Which means it costs a lot and they probably could not justify it.
Kobo did have something similar, called "BtB" if I remember correctly. Unfortunately, they didn't have it for many books, and it only lasted a year or so. The effort required to make it useful has to be big. I don't know how Amazon handless it. Or do they just do it for the very popular books and no one comments on it for everything else.
|