If it's in a library, it's going to be in special collections, and nobody's going to see it. It will be preserved and kept safe for the rare scholar who has a legitimate need to see the original, but for most purposes the archetype is never needed. We don't have the archetype of Vergil's Aeneid, but it's well studied nonetheless.<p>If it's in a private collection, a scholar who really, really needs to see it might make an arrangement with the owner. For everyone else, though, there are copies at the local bookstore. Bonus, though: if it's in a private collection, there's a chance that it physically is in a library. Some private collections are housed inside public (usually university) library special collections. From the investor's standpoint, it's worth it to have professionals who know preservation keeping the book in climate-controlled, reasonably secure facilities.