To create great wealth in a vibrant capitalist society you have to have some model about the world you can exploit. It can be a better rocket design, some insight into human psychology that can help you raise money, or something else.
Some people fall ass backwards into money through luck, but that's rare, and people with great wealth don't have that luxury because they would squander it away and won't be able to grow what they have been given. At any extreme, you have to have both luck and skill. The best athletes are both incredibly gifted and incredibly hard working
They could be wrong on some things but to pretend they don't have a somewhat functional world model that is different enough from the consensus that it allows them to exploit it for great wealth is just naive.
I think the flip side would be "if you're so smart, why aren't you rich?" I prefer why aren't you happy myself, but sure, random person commenting on the internet about how the wealthiest people in the world don't know anything about the world, why haven't you exploited your superior knowledge relative to said billionaire to amass great wealth for yourself?