There are probably no hard rules here, but I just sold a boat last week, thru a broker, and here's how it went. He asked my very bottom dollar (it was 65k) so he put it out for 72k. He got an offer, asked me if I'd come down 1 and he came down 2, and the deal was done. Happy buyer, happy seller. Every deal stands on its own, but your are correct about 1 thing, the season is half over in some parts of the country. Maybe the seller (not the broker) is starting to feel the pinch. Give the 10% a try, you can always negotiate to a mid point. Since you point out the boat is really dirty though, I would be real careful during the sea trials. If you are not too experienced in boats, try and find someone who is. Hidden repairs can be expensive.