I've seen them new for up to 1500. This guy dont go into much detail on whats all been done.. If its got a performance motor setup.. it could easily be worth what he's asking. It might not be worth it to some.. but that dont mean its not worth what he's asking.
I could find a pot that cost over 2,000.. Not worth it to me.. but i'm sure someone might find interest in it and pay its value.