Seven 7 For Mankind Jeans

Apparently, Seven 7? for Mankind Jeans are hot, or at least were.  In my travels I found a couple at a Goodwill in Atlanta.

I saw them on 10/20/10.  I don't know the sizes.  They were priced around $20 each and seemed to be in good shape.

And somebody enlighten me please (Nick speaking).  Why do people pay $300 for a pair of jeans, new off the shelf?  There are some things that look like they should be priced higher.  For example, a very good suit, expensive polos, etc.  But jeans?  I can't figure it out. 

However, there they are for the taking!