In 2008, my son was in the hospital for a week or so, and while I sat by his bedside, I read books on my Kindle 1. No one knew what it was back then. It's a new world now, and ereaders are everywhere. Also, self-publishing has benefited from ereaders and tablets. It's difficult to compete on price in print publishing, but it's easy to do with ebooks. Amazon still dominates ebook sales, as every self-published author knows. The Kindle Unlimited (KU) problem requires that authors a) only have that ebook for sale on Amazon and b) be paid by pages read rather than per title. A lot of authors, me included, often make more on KU than on sales. This and the smaller number of non-Amazon sales make KU attractive, for certain genres. especially romance.