Originally Posted by kevinp
But who's going to write the addendum? The publishing company certainly won't. They can't make much money doing that. They would rather sell a completely new version of the book.
They don't have to write the addendum AFAIK, Just print the changed pages or additions with references to the original page numbers. many would buy the new edition to avoid cross referencing, but those who couldn't afford to would have an alternative.
Still publishing new editions with little or no added content seems to be an accepted textbook practice. Sometimes just the first few pages are changed.
And that is the point they would rather sell a completely
new version of the book, but when is it a completely new version? For that to happen it would have to be a new book, not a new edition.