I know some of those limited pressings are worth money. While not as old and not an album, the "Love Buzz/big Cheese" single that Nirvana put out on Sub Pop which was limited to only 1000 copies usually fetch around 2 grand.

On a side note, we have an Elvis signature because when my dad was younger and Elvis was big, he sent a letter to Elvis, but sent it certified so he had to sign for it. We have it in a scrap book that has that, a couple ticket stubs and a couple flower petals from his funeral.