if legal way, you need
1. luck
or
2. insanity to bet on very very rare outcomes
if illegal way, you need connections to people in charge (gov)
no other way to become true billionaire (im not counting those, who have larger debts than net worth)
or insider trading
BTW, one of the bet investor is BRK aka Buffett, he is doing 20% p.a. since his day1, and that is INSANE. you could buy in with simple $100 30 years ago (say a two day wage), today you would have 237fold. If you would do it every year regularly, you would have 1417fold of two day wage. In real number, its $146K , out of $100*30years. make it $100/month and you would be millionaire (1.7M) in 30 years, without any notice in your purse.
Of course, who could know he will beat the markets ?
If what you're saying is that there are various of ways to make money from money ( legit or illegal ), then youre right.
Of course luck is part of the game but it's not like betting on every rare occasions but in my opinion it's your ability to make that occasions rare. Skills is vital in this field. If we're thinking on having some close relatives in order to be at the advantage when doing some work whether it is government and private well you can force your way in but it is true. It is really good to have some back up.
That buffet must have study engineering economics, probability and statistics to beat the odds of the market. It's not an easy task. Ingenious.