Today they are worth over 600sd and people go rabid for a pair.
Why?
They are not limited. They are like any other pair of shoes. There is no difference between them and anything else.
They were only available for a little while before being released in the archive, which to be honest is not so uncommon.
To me they are not worth the amount of money they go for... which may have to do with my opinion on Jeffrey Campbell.
