This information is included in the latest version of the book, How to Launch a Christian Best-Seller.
Some authors in the Network have “sold” thousands of Kindle books for free during the time their ebooks have been free in the KDP Select Program. While they didn’t receive royalties, their Kindle books were widely distributed, and many ranked in the top one hundred “free” Amazon ebooks. When Amazon returned their ebooks to the “paid” category, briefly they maintained their best-seller ranking, becoming a best-seller of sorts by default. In many instances, the increased sales of ebooks carried over into print books or other books they had published. To learn more about KDP Select, visit: http://kdp.amazon.com/self-publishing/KDPSelect.