Today's discovery was that Amazon's Kindle eBook format appears to be different from Nook, iBooks, Kobo and just about everyone else. While I can appreciate the need for any business wanting to maintain a competitive advantage, this strikes me as just plain silly if not "cutting your nose off to spite your face." It has the potential to antagonize both authors and customers.
As an author, I'm in the "I wish I had known this sooner" category. Possibly I may have chosen the other format. At the very least I would have been alerted to the need for two eBook formats for a comprehensive market coverage. And, from what I can tell, it is not a simple conversion process, but entails going back to the original manuscript. Thus, it has an impact on maintaining a consistent interior book design.