Record companies release alternate takes and original demos of classics so that fans can experience the entire creative process (ex: The Beatles SuperDeluxe editions.) But publishers never release alternate and endings, or deleted chapters. Why is that?

These editions would spur sales, and reengage interest in an overlooked or classic novel, and let readers be able to debate the merits of the authors' original intent, or thrown away ending. Hemingway apparently wrote 7 endings for "a farewell to arms". What were the others? Would they have worked better? Do you think publishers should release the equivalent of a bonus disc of outtakes?