I think a very large portion of ebook users have Kindles or similar e-ink devices. These are great for reading text-heavy novels, things you would normally get

I think a very large portion of ebook users have Kindles or similar e-ink devices. These are great for reading text-heavy novels, things you would normally get as low-quality paperbacks anyhow. They are horrible for picture books and the like--black and white, low resolution and you can only view one page at a time. Normal screens like tablets and computers are better for picture books but have other issues--they're relatively expensive, run out of battery quickly and strain your eyesight. Ultimately, it should come as no surprise that picture books do not translate as well to ebooks as novels.