Well, why don't you include the "no backtalking" into your demand?
"Alright peasant, hand over the 2 grand, and I wanna see a smile on your face while doing it.
If I even hear something that is not a "yes, mr. pirate sir", you get a express ticket to scrapland."
Trader pays, then says something stupid.
"Well, you really wanted that ticket uh?" proceeds to put a new hole on the ship, crippling it to 5% hull, and flying away with the plunder and the satisfaction of avenging his ego....