The domination of Amazon’s Kindle increasingly means that books published in any other format don’t really exist. Authors put their books on Amazon and only on Amazon, knowing that means many eyeballs and many sales. It means that they aren’t going to miss the few sales they might have had from people who prefer other formats. Or who, for whatever reason, simply refuse to buy into Amazon’s 800 lb. gorilla approach to publishing.
So, once again, I read an interview with an author whose book sounded interesting enough that I might think about buying it. But no. It’s a Kindle edition. And that’s the only edition. Maybe I have the wrong attitude, but I believe every author who publishes their book as Kindle-only is helping to support a monopoly that’s out to crush other formats, and the publishers, including self-publishers, who use them.