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Anyone know where her sales figures are coming from? Are they self-reported?

She's obviously doing pretty well based on her Amazon rank, but I'm a little skeptical of the 100-450k per month number.

There's a bit more info in one of the articles he linked to. Specifically, in the HufPo piece (http://www.huffingtonpost.com/tonya-plank/meet-mega-bestsell...) she's quoted as saying:

"AH: As of Tuesday, January 04, 2011 at 9 PM, I've sold over 185,000 books since April 15, 2010."

Thanks! That interview is much more interesting and informative than the OP.