There is a significant difference between books and music that many fail to see. While it is important to be able to buy a music track on the go, which would normally cost less than a buck and is less than 5 minutes in length, buying books on the go isn't that significant in comparison.
I buy a music track just to try it out and see whether that artist's work is worth listening too or not. But since reading books takes a significantly longer time and is a far more cerebral activity, I usually tend to read at least a couple of reviews before deciding to buy it and it will take me days to weeks to finish reading it. So, I can buy a couple of books a month and I am sure I will have enough time on a PC to do that, while I wouldn't want to get on a computer every time I want to buy a song.
Also, the audiences are very different. Music is more mainstream and almost everybody listens to it, while reading has a smaller audience and generally has a higher rate of well-educated people (no statistics here, just my observation).
There isn't much money to be made in books compared to music. I don't know why Amazon is so eager to claim this market for itself, and comparing itself to Apple and its iPod is ridiculous in my opinion.
I'm off-topic here, am I not?
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