You have a sick sense of morality… The Ayn Randian idea that greed, wealth, and power-lust is the only thing that motivates humans to creativity and industriousness is sick, psychopathic, and uniquely USAn.
Good thing that Mozart, Monet, Newton, Maxwell, Einstein, Schrodinger, Bose, Pasteur, Salk, and may other creative and brilliant people weren’t motivated by getting really rich… And the modestly-compensated-but-happy physicists and climatologists Michael Mann, James Hansen, Gavin Schmidt, Rajendra Pachari others may yet save humanity from destroying itself along with 99 percent of all other species.
And actually, most developed countries DO have caps in incomes - it is called a steeply graduated income tax rate which in some countries approach 100 percent. And sure enough, top executives of European or Japanese corporations make only fractions of their counterparts in the USA - while the workers on the shop floors are paid much better. And guess what? These companies are better run and produce better-quality and more innovative products than any US company does.
And the worst of it is that, as the example of many Latin American nations, Indonesia, Vietnam, and the Philippines over the past 60 years show us, the Obscenely Wealthy will murder us by the hundreds of thousands using their hired governments and gangsters rather than give up even a tiny fraction of it so that others can merely live.