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The main reason, I think, is battery life. There's also a very popular reflective LCD reader that has its share of fans. The main problem of LCD screens is the battery life. That's simply much shorter (even of the Ipad, which does have a nice battery life) than the average e-ink device.
Also, you can't compare reading from a computer screen to reading from a hand-held device. I wouldn't even think of reading a book on my computer, but I've done so on my handheld devices. You can't really sit comfortably (for reading) behind a screen, and lugging a laptop around also doesn't make for comforable reading. I bet, that if you have a, let's say, 19" e-ink screen as monitor (let's forget for a moment that it's not made for it...), I doubt you'd read a whole book on it, even though the technology is perfectly suited for it.
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