- Tesla was a multi millionaire during his life who decided to risk, and lose, his wealth pursuing ideas that did not work out.
- Gutenberg was granted royal title along with all the privileges of such including an endless stipend and industrial volumes of grain and wine during the 15th century. Works from his press sold, during his life, for what was years of salary per copy. He was almost certainly a millionaire, though my point was primarily related to capitalist societies. The 15th century was still more feudal come mercantalistic.
- Curie won the nobel prize which entailed a prize of hundreds of thousands of dollars and a solid gold medal - almost certainly totaling in the millions of dollars as well.
And so on. And in many ways a billionaire of today is what a millionaire of times past was. I don't mean because of inflation but in terms of relative scarcity and effective 'power.' Ramanujan is the closest to a reasonable example, but there are significant extenuating circumstances there. He was religious to the point of bordering on insanity, grew up in colonial India, and had no interest in anything other than the private pursuit of his mostly abstract mathematical works. Whatever he may have 'deserved', he certainly was able to live his life as he wanted.
The big point here though is that this is not a coincidence. When people contribute to society, they tend to be rewarded. There are certainly some exceptions, but the great thing is that they are now a days, without doubt, the exceptions.