I don't know a single case of a person getting rich out of hard consistent-over-time work. All of them inherited, exploited the poor (Nike etc) or had viral success. Mark Zuckerberg becoming a billonaire in 2 years is NOT an example of hardwork/gains.
Even if you inherit wealth, if you are not capable you can lose it very quickly. So in that sense, people who build on inherited wealth have to be admired too.