As a previous poster said - they are worth what someone will pay. In my case I was FAR too anxious to have one, a Texas wagon that had sat outdoors under some trees at a lake house. Little did I know what extensive rust I would find as I began disassembly - around the windshield, in the floors, a rusted and leaking gas tank, hidden rust in the doors, leaking radiator and brake cylinder, some pretty good generic body damage, beat to hell interior, etc. Mechanically shot but running, I paid WAYYYY too much for it - but after seven years, it's approaching full restoration completion. I knew if I paid that much, I WAS GOING to ride it out - save it from the scrap heap - and make it CHERRY. And I'm glad I am.
Don't ask. I'll never tell. Like I said, I wanted it. Funny what you'll give when you want something bad enough.
Chris