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Bob,
The >$100k number was presented at an industry conference fall of 2009, I believe exact stat was $116k and the data originated from Bowker. I cannot confirm that it is included in their "2008 U.S. Book Consumer Demographics and Buying Behaviors Annual Report". There are always exceptions to the rule, but this is the data we were presented.
We ourselves also conduct frequent survey research of eReader device users from our own registered customer mailing list and though our social network sites.
Kurt
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