What pays the most in Sea of Thieves?

I'm curious, what exactly pays the most in the game of Sea of Thieves? Is it treasure chests filled with gold and valuable artifacts? Or could it be the rewards from completing difficult missions and quests? Perhaps there's a specific type of cargo or loot that fetches a higher price on the black market? As a seasoned pirate, I'm always looking for ways to maximize my earnings and become the richest captain on the seas. Can you enlighten me on what strategies and tactics I should employ to make the most money in Sea of Thieves?