I don't consider myself immune from hucksters. On the contrary, I've certainly be tricked and manipulated before and I expect I will be again.
Given that hucksters have existed for as long as markets have, I don't have your touching faith in the power of markets to eliminate them.
Have you considered that maybe the majority of successful companies in the world are fulfilling customer wants and needs and thus making what you call Pareto improvements? And maybe it's just that the other "dumb people" derive joy from different stuff?
The market sorts these things out. It is mostly efficient. Not perfectly. But mostly. A company that is providing net-negative value to the world is a short-lived company.