Do I really have to explain it?
Well, all right. Political power = license for violence, a very dangerous thing. While wealthy people are at worst (according to your argument) merely useless.
That is all? It is not much.
Wealthy people are quite capable to instigate wars and to push masses of people into poverty, corruption and crime.
I don't know. If honest and fair republic or good monarchy is not possible, then the next best choice is true aristocracy.
You should ponder the words of Theodore Roosevelt
"Of all forms of tyranny the least attractive and the most vulgar is the tyranny of mere wealth, the tyranny of plutocracy."
and
:"The triumph of the mob is just as evil a thing as the triumph of the plutocracy"