Lots of people want it, but those who have it aren't generally happy. In recent years there's been a lot of psychological research about people's happiness set points. In general, people adjust to an increased income very quickly, even if no work is required to earn it (e.g. lottery winners).
On the other hand, many people do find fulfillment through work. In that sense, trust fund beneficiaries may have a tougher road to follow. Another thing that can defeat happiness set points is continual goal setting and achievement, once again something that the idle rich don't need to do.
