For sure. So I'd say if we are excluding significant portion of fraudsters, finance and Putin's friends, that would remove a significant portion of wealthy population and this rule doesn't work and doesn't apply to them (which is already skewing us from the truth). That leaves us with general working and honest population. Among them IMO this rule is mainly applicable. The more people you can help and solve their problems, the wealthier you get. But it further depends on circumstances such as political system, country and occupation. In some or many places health care and education specialists are less wealthy then say pilots. I'd argue that teaches are doing more profound job in terms of usefulness to people then pilots just bringing people from point A to point B. And in both cases you need to exhibit certain personal qualities and skills to do these jobs. So i think, in theory and probably in most cases, money on its fundamental level Is made to solve this equation, and an ordinary person looking to grow their wealth can use it as a guiding principle.