I own and use both e-ink Kindles and tablets on a daily basis but do the bulk of my reading on my Paperwhite and am certain that the majority of avid readers prefer reading on e-ink devices.
Although Amazon doesn't release sales figures, I'd guess that the vast majority of their ebook sales are made to avid readers who buy 3 to 5 ebooks a month. I generally buy about double that amount, spending $50 or more per month on ebook purchases. I'd be surprised if the average tablet owner reads more than a book a month on their tablet.
The market for tablets is much larger than the market for e-ink readers because it's a multi-purpose device but I doubt it will ever replace e-ink devices for avid readers. Again, using Amazon as an example, I'm fairly certain they make far more profit on ebook sales to e-ink Kindle owners than they do on ebook sales to tablet owners.
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