How do you think most rich people got to where they are? Some are lucky, sure. Some had it handed to them. I'll admit that just as readily as I will admit that some rich people (and some middle class and poor too!) cheat the tax system.
But the fact is, lots of rich people got rich by doing SOMEthing very well and working their asses off to move up in life. What makes you say they are allowed to be average? I don't understand what you mean.