[Tichy]

"People brought iPhones, iPods and iPads for Wozniak to sign with a marker. "Now your phone is not going to be worth as much when you sell it," Wozniak said to one woman before signing her iPhone 4"

Dear Woz, I am sure an iPhone with your signature is worth a lot more than a bare iPhone.

[gjm11]

Dear Tichy, I am sure Woz realises this and that's part of the joke he's making.

[Tichy]

OK, maybe. Then again, maybe I realized that Woz realises it and it was part of the joke I was making.

[robryan]

Well he means it will push an old iPhone back up to original value,