It could be argued but it’s a large assumption on its own.
Stock markets are recent inventions; some hand wavy way of saying “this is exactly the right way to store value!”
Why must that ideal be externalized onto others? Why do I have to believe some hedge fund is indeed worth N dollars?
Mendacity of the elderly is not a good enough justification for belief.
Correctly engineering a road, medicine, or making art does not at all rely on such belief.
Someone who is wealthy may not have skills as you describe it, but if they are investing their wealth in the stock market for example, it could be argued they have a much more outsized positive impact on society than the average person.