Why are Superbirds worth so much?

I've only seen maybe 5 or 6 'tonas or 'birds. Back in high school there was a guy running around town in one, I believe it was B5 blue but don't quite remember. Personally I like the Daytona's over the 'Birds. They just look a little better in my opinion. Saw one of each go for almost $250,000 in B.J. I would love to have one, but I'd settle for just a wing and a nose to make my own. ;)