Tracking sales of my ePub books. Seems like almost no one uses Kobo and iBooks is limited as well. I did an experiment with one book on Amazon, and immediately that book jumped in sales. I think that for many people, Amazon is like going to the library once was. So all my de-escalation books are up on Amazon (and Barnes/Noble NOOK as well). It's been quite an investment of $$$$ to get ten books formatted (and Amazon, using MOBI, is a different formatting system than that used by other eBook readers). So, the first task will be making back the money I put in.