He's probably right on with his price. And they made only 100 or so of them according to the serial numbers found. I think a couple are gone when Charlie had his fire up in Minnesota. IIRC, he had a NOS one or two that were lost.
It would be cool to have, but that is alot of coin for me. Neat to have, restore, and show, but if someone was buying to put it away and sell later for a profit, I don't think the value will go up much more. IMHO, prolly at the ceiling pricewise. I don't have a crystal ball and could be all wet, too.