Asking vs Selling price
"What I don''t understand is why so many list their boats at unreasonably high prices."
I believe the "high" asking price initially set by the owner, is a reasonable figure to him/her. The amount is most likely based upon a compilation of the Owner''s total investment in the boat, the broker''s fee and a negotiation margin.
Just a matter of time before market reality sets in and the Owner accepts the inevitable loss. I suppose it''s human nature to not account for the cost of enjoyment during ownership.