The only unrealistic expectation is thinking people will be happy working unequally hard for equal pay. Capitalism funnels that motivation to set oneself apart into a system where many can benefit from the creations of a relative few. Politics came about long before the first political system. It stems from the evolutionary compulsion to compete and reproduce. There will always be in-crowds and out-crowds of any group of sufficient size. This is where cronyism comes from. Not the political systems themselves. Humans play favorites, not free markets