Not really an opinion, but a thought. Why don't you show him this discussion, and let him respond? My analysis, for example, could be way of on the value of the boat and the big motor. He may have good data as to why. That could let you establish a fair price.

I'd suggest getting a copy of the sunday Oregonian. For some reason, the oregonian lists lots more sled style boats than the washington papers, and that can give you some data to compare to. You can get the paper at a Barnes and Noble or similar bookstore.