Well, to be honest I don't care all that much about them myself either, but when it comes to actors and voice actors from anime, I'd love to meet them and talk to them even for just 30 seconds, and autographs usually go along with that, so...And I guess if you're really lucky, and get the right autograph, from the right person, on the right object/product, then that object/product could potentially become valuable at some point, and you can sell it for money at a pawn shop or whatever. But yeah, that would require a lot of luck, and probably some planning (buying or bringing with you the right item to have signed).