Today, the idea of a piece of media (book, comic, album, movie, game) being "rare" is almost absurd.
Specific editions and versions, sure, but that only applies to the actual physical objects (and, even then, applies a lot less than it used to, while eBay exists.)
We have the world at our fingertips.
Were it not for modern copyright law, faithful reproductions of, well, everything could be everywhere.