Interesting topic.
I know loads of well paid people, and the only thing they have in common is hard work.
I am trained in medicine, and the medics I know are comfortable, but certainly notstinking rich. My brother, who is a fashion designer, makes well into the 6 figures and earns much more than my GP friends. I know welders - a profession no educated person thinks about, and they earn almost 200k with great job security and no uni debt.
I know loads of bankers and ex bankers. Many start in the profession just for the dosh and most leave the profession due to terrible hours with not terribly interesting work, or are victim to the routine culls.
The richest people I know - I am talking private jet owning sorts, also are varied in their career paths. One grew and diversified a family grocery business (he had a liberal arts degree with a theatre studies major), another has a telecom engineering background who went on to rise up in a commodities firm, and others are in private equity or hedge funds.
The next tier (8 figures +) are entrepreneurs in various fields - many in the tech sector who sold their companies, several sold multiple companies.
The youngest self made millionaire I personally know is from high school. He made a million during high school on baseball cards.
What I am thing to point out is that there are a myriad of ways to make a good living, and the thing that seems to tie all these people together are long term planning, hard work, and grabbing opportunities given. the stinking rich ones are the ones who had interesting passions with great luck. Most of the hard working dispassionate ones are in the comfortably off 6 figure range.