Andrew Ladd recommends that book publishers sell alternative drafts:
[W]hat’s wrong with a little naked commercial ambition in the publishing industry, given everything we’re always hearing about the death of the book? There’s clearly a demand for this sort of thing. The New Yorker, for instance, has previously published “early drafts” of well-known stories by famous authors, and there’s already a market for new translations of foreign language work – not to mention the perennial re-issuing of Shakespeare and other classics according to slightly different original texts. If we’re already doing all that, why not different drafts of contemporary books as well?
I suppose part of the objection might be that, by definition, an author’s last draft is supposedly the best. So when we have the definitive final text – unlike with Shakespeare et al – there’s no reason to publish a “worse” earlier one. Yet this is a silly argument, because any writer will tell you that, by the final stages of revision, most changes are a matter of minor rearrangement rather than major improvement. There are certainly plenty of things in my early drafts that I cut and now wistfully re-read.