Many of these people follow a pattern, where they (apparently) come from nothing and very early in their careers become advisors or get capital from a very rich and powerful person/company. This should give you pause and realize that it doesn't happen to a normal person. The true answer is either their parents or close associates, people they trust. Bill Gates is an example where his true golden ticket was a contract with IBM that was only possible because IBM's CEO was a trusted friend of his mom.