Very few brokers will spend the money needed to properly advertise your boat when they only have an open listing.
A broker works much harder on the central listings he has.
Don't waste time listing the boat too high in price, because if it doesn't sell, you'll be reducing it anyway.
Ask your broker to check comparable listings and have your asking price be competitive, or be prepared to justify why your boat is worth more.
If you're willing to consider trades, don't forget to tell your broker. Sometimes it makes the phone ring!