Speaking for myself, when I convert a book of mine into an e-book format, I have to:
- Alter the text file with appropriate headers, chapters, etc for the format;
- Possibly doublespace the paragraphs, or substitute paragraph tabs with an extra hard space;
- Input text into e-book creation software;
- Input cover (a whole 'nother ball game);
- Format the e-book meta-files with title, subject, author, copyright data, etc;
- Create e-book;
- Go back and proof the file, to make sure everything came out properly, and looks right. If something is wrong, I may have to go back to the original text file and start over;
- Repeat for the other 5 formats I save each book in.
You couldn't even macro that into just 3 clicks. And every serious publisher is going to have to go through at least all of those steps on each book they format. It may not be a time-consuming process (other than writing and proofing time), but it is step-intensive.