[crickets singing in the dark*]
Of family, my wife and I are the only ones using ereaders, and the only ones that frequent online book stores ... and my wife never left a review, not sure what that says.
Seriously though, the only reviews worth much are unsolicited, and since only a small percentage of readers leave reviews the only way to get many those is to market your book well enough to have lots of readers (note to self: need better marketing).
I'm not even much of a fan of the "free copy for a review" basis you see spoken of in Goodreads reviews, but a quid-pro-quo system of reviews seems too much like buying reviews if you ask me, and that's
not something I'd be happy to support.
* We need a smilie for this!