An "exclusive" listing would mean you don't recognize any outside parties in a sale?
I think you mean a "Central Listing" -- that's different.
With your boat, you want the widest coverage to get to the most likely purchasers. You really don't want a lot of BS or psychodrama.
I'd refer the prior calls to the agent in Florida that is listed on the sheet currently , unless you have some prior relationship with the "trolling" competition.