The issue here is that a picture of a book is not a book, a copy of a game is the same game.

That... depends. A lot of older games shipped with physical artifacts which were an important part of the game: manuals, code wheels, custom controllers, "feelies" in Infocom games, etc. You can't easily make a copy of those. (And preserving them isn't just a matter of throwing a copy on a hard disk.)