This is an interesting and detailed report by David Kazzie on his blog, relating how his generally positively reviewed book, which barely sold, rocketed into to the top 100 on Amazon.
One week ago, my book was dead in the water. And I mean dead. After a promising start last summer, sales crashed, completely, totally and spectacularly, despite wonderful reviews (from people who didn't even know me!). From December 1 through January 24, I sold 21 copies on Amazon. One on BN.com. And that was it. Barely enough to fund a lunch date for me and my wife. The previous couple months hadn't been much better. To be honest, I was trying to forget the book even existed as I worked on my new manuscript, my internal doomsayer wondering how badly I'd effed my career with a self-publishing disaster.
What's also quite interesting is this comment about his sales on non-Amazon platforms:
At first, I wasn't sure what to think about it, especially given the exclusivity requirement. Part of me was aghast -- how dare they ask me to pull my book from the other retailers! And then something occurred to me. Between October 1 and December 31, I had sold a grand total of .... ONE book on all the non-Amazon platforms -- that one sale on Barnes & Noble.
There are a lot more goodies in there, so worth reading.
Which you can do right here: http://wahoocorner.blogspot.com/2012/01/how-kdp-select-saved-my-book.html