Also be wary when "things just don't seem right." I know that's a rather vague statement, but here are some examples. The owner is a person who never appears and is always represented by a "friend". Used boats normally have a lot of the owner's cast-offs on board. Beware of a boat that is totally devoid of the little things like useless junk in drawers and so on. The boat appears to be economically beyond the means of the seller. While its not nice to stereotype people, sometimes there's just cause for suspicion. If the boat and the owner somehow just don't see to "fit," don't ignore the disparity.