Ahhhhhhhhh Magic Words.
Kinda like: He stepped onto my property and I have a right to defend myself. So I gunned him down.
Anytime you hear Magic Words you can be pretty sure they are BS.
It does work in *some* places. Not including the USA.
Caribbean on the whole
In Grenada, it's called a "customs handling fee" of a flat 6% on all the items including
freight. Rarely one slips by without paying. You are often bullied into using a customs broker, but most of the time, with a simple order you can slip by. At the cost of a customs broker in Grenada, sometimes it is easier and cheaper to just pay the duty.
St. Lucia, no duty at all but you must have an agent, ec$200.00 or so, however, they will deliver your items to the dinghy dock from the airport or seaport, so it is worth it, IMO.
In Trini, there's no fee, but you must fetch your item from the airport or seaport and stop by Chaguaramas customs for clearance, even if you have cleared at the airport! Transportation in Trini is reasonable, but it can still be tt$300 or 400 to get to Point Lisas and back. These are the ones I know for a fact, and use frequently.
I have no experience there, but I hear Martinique and Guad have no customs duty on yacht imports.