Isn't $710 a bit much for a crummy PSOne demo - seemingly worthless when it was handed out 12 years ago? The collector who won the bidding for NBA 2-Ball thinks he got a steal on the price.
It didn't come close to breaking records set recently by other rare titles, but NBA 2-Ball, a freebie PSOne disc given out at the 1998 NBA All-Star game, probably set a mark for demos.
At the 1998 NBA All-Star Game, fans received discs with the demo for a PlayStation game called NBA 2-Ball. The game was pretty bad - possibly defective - but it's extremely rare. So a surviving copy may be extremely valuable.