FTA: This scroll is one of the most important literary documents still in private hands.

and: However, the return of the scroll to the auction block echoes an earlier controversy. In 2001, when the manuscript was last offered for sale, Carolyn Cassady – the former wife of Neal Cassady, the real-life inspiration for the novel’s Dean Moriarty – denounced the auction as “blasphemy”, arguing that the scroll belonged in a public library rather than a private collection. “Jack loved public libraries,” she said at the time, adding: “If they auction it, anybody rich could buy it and keep it out of sight.”

Its because there is more than one draft.

Yes, this is the iconic version, but the whole point of Kerouac is that its "jazz" and improvised, despite the published novel being at least 6 drafts different

Not to mention the french version, and the previous attempts at the novel.