It there is one thing I've learned from watching Pawn Stars, it's that with out a certificate of authenticity the autograph doesn't mean squat.
Isn't that what they call Drew for? I see them buy plenty of stuff without letters of authenticity if Drew confirms the signature is real. It very well could be real. Is it something Steve jobs would have done? If it is, then it's very possible it is real. The dude deals in that sort of thing. I doubt he's a dummy and knows what he has. If you cannot find history of him scamming others, then I'd assume it's possible that it is real. Who cares though? Steve jobs didn't make the iPad, apple did.
Maybe if he licked it or something...
Matt