A large pool of middle class is the true measurement of a nation's economic success, especially the professional and business class.

Billionaires are no indicators of economic success. Look at Russia, they do have a fair nos. of billionaires and we all know how they make their billions. Granted there are genuine billionaire enterpreneurs, sadly, many are crooks.

Like those who are engage in immoral activities such as gambling.

The billions (they) made from his casino, the billions (they) made from (lotteries), the billions (they) makes from (betting), how have they benefitted society? This includes all those who manipulated the equity and curreny market and other speculative market.