Caribbean pirates made money by being a parasite, a negative externality, an external risk for shipping and merchant sailors. They made their living through stealing from a highly profitable industry (in this case, shipping). We don't see many pirates anymore, because nature innovated centralized nation-states with far greater military capabilities.
People can all be looked at as black-box units with objectives, needs, and wants: incentives. People fulfill their incentives through their own work, or through arbitrage with other people. Nature, the largest free market, facilitates trading of these incentives between people. Nature, like all other markets, seeks to maximize its