Expensive Old Games

I was hanging around the vender's alley at the Student Life Centre (SLC) today at the university...and noticed a copy of the old classic Super Smash Brothers for N64 was no longer there. Apparently someone valued that game enough to buy it for a crazy $60! I mean, you have a game a great game, that came out 8 years ago, being sold on the secondary market for the price of a new released game. CRAZY!