Because how would those without money ever afford to be super evil?
Do you know what a volcano super base goes for?
The imbalance of power leads to only the rich being able to become super villains.
"have I not reason to hate and to despise myself? Indeed I do; and chiefly for not having hated and despised the world enough."
"There have been times when only a hair's-breadth has intervened betwixt myself and the seething devil-ridden world of madness; for the hideous knowledge, the horror- blackened memories which I have carried so long, were never meant to be borne by the human intellect."
~Clark Ashton Smith