What the... if I knew about the signed game as first prize I would have bought a DS and Tetris just to compete for it straight away... man I could buy such an item for A LOT. I saw someone mention 5000$ though... lol.
Those sealed FDS games aren't that expensive at all, even I have one.
No, it's the fact that Miyamoto signed it. Also, it's not the system thing. It's a ZELDA game, which is guaranteed to be rare, and even rarer now Mr. M signed it.
Rumiko Takahashi got so much fan email about the character that she brought her back in the manga, it was going to be completely different originally (with the alien of the week type).