There really are no hard and fast
... rules for this kind of thing. As Tim and others note, everything about the sale of a boat is negotiable. Yet typically, a prospective buyer, who has signed a contract and put down a deposit, pays for a short haul for the bottom and running gear to be inspected. If the boat is already on the hard, the buyer typically pays to have it launched for a sea trial. What normally happens after that is if you decide to buy the boat, it stays in the water awaiting movement to your home slip. If you decide against buying it, you pay to have it hauled back onto the hard. In this particular case, I have to say that nice looking, clean boats, that are well equipped and everything works, always sell -- and always sell faster than boats that are dirty, have growth on the bottom, and gear in bad condition. Any seller who is really serious about selling ought to know that if his boat's bottom needs to be cleaned (not necessarily painted -- but if it were my boat I'd paint the bottom too), he ought to have it cleaned or clean it himself.