Re: "You make your money buying the boat, not selling it."
Ask your broker for a historical sales record of same boats over the last 5 years. I did not realize this but it helped a lot in my purchase strategy after I realized I could request it. Brokers have access to a "MLS" system that the public does not. I could see the asking price, selling price, and time boat spent on market. It does not of course take into consideration condition but you'll get the general idea. Immensely helpful!