Back in April, I wanted to run a promotion where Upload would be free on Kindle around the release of Transcendence. Regardless of how good or bad the film was (I personally think it was weak, but didn’t deserve to be hammered quite so hard by critics), it was a great opportunity for me to draft a marketing giant. I “sold” over 2500 copies in three days, which was huge by my standards. But, in order to take advantage of Amazon’s KDP Select marketing features, such as Countdown Deals, Free Promotions, and free lending via the Kindle Owners’ Lending Library, I had to make the eBook available exclusively on Amazon for the 90 day KDP Select membership period. I had to de-list it everywhere else. Since Amazon completely dominated eBook sales, at least where my own book was concerned, this was no great loss for me. In fact, I never bothered to re-list it elsewhere. Until this morning, when I received a tweet from someone who was specifically looking for the book in ePub format, and couldn't find it. So I republished the eBook to Lulu and Kobo, and it will eventually show up on Nook Books, Google Play Books, and iTunes Books, after their review processes. (Kudos to Kobo for making it easy and fast to re-list a book!)

Which made me curious. How many readers are disappointed if they can't get a book in ePub format?

And, if you prefer ePub, why?