Even with cheap printed books, you can tell that someone proofed every page. With many e-books, they’ve clearly just been run through a converter with no proofing whatsoever.
Astute comment from Gruber that reminds me of the transition from handwritten manuscripts and texts (often laboriously copied) to texts manufactured on printing presses at the end of the late Renaissance.
Over the next five years, I expect for ebook curation and formatting to become a serious issue. This will be especially true for the education space as we teachers continue to move away from textbooks and towards reading devices.