I don't even know how to calculate it. I've read about 120 ebooks since I got my K3 in Dec 2010, so that's 17 months. If I had to guess (because I don't track this info), I'd say about:
60% were either freebies or library checkouts
20% were $3 or less
10% were more than $3 but less than cover price (sales, bundles, etc)
10% were full-price (ie, equivalent to paperback price)
I'm going to estimate and say that comes out at about $160.
For this exercise, I'm completely ignoring the huge mass of free books that I haven't read yet.
Had I bought them all in paper (as I rarely used the library when it required going there), I would have probably paid my pre-ereader average of $6 per book. That would have been $720 total.
But, of course, these numbers are actually meaningless, because had I not gotten my Kindle (and later, my Sony) there is no way in the world I would have read anywhere close to 120 books in that time period.
TL;DR - I don't know.
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