As usual we seem to want everything both ways... ebooks cost too much, they're badly edited/proofed/formatted, we want better product... improving quality of ebooks requires human intervention to proof well and get a decently formatted product, I know we'll just materialise a few thousand proof readers/editors... oh wait, they don't exist because their work has been devalued over the last few decades and their jobs ceased to exist and they didn't want to work for free...
Why isn't every book in the world converted to perfect eformat? Well let's see... try time, people capable of doing it, people not prepared to pay for the work to be done and everybody wanting something for nothing... tough world isn't it...