I don't know about the dealer charging more than double what he paid for the boat. That might be a bit extreme. The dealer I sold my boat to marked it up about 30% what he paid for it (but he also got money from selling me a new boat).

Regarding the no returns policy, I think that may be fairly standard on used equipment. Especially if the boat is on consignment. It should definitely be a complete boat though - no missing parts. And he should rig it, or at the very least, be willing to answer any questions that you have.

sm