Why are today’s leading spiritual teachers be billionaires? I know people who know more about how to live a happy and fulfilled life than e.g. Naval, and most of them are broke.

Money simply does not play a part in your spiritual enlightenment, there may be some folks who are both enlightened and rich, but statistically most of them would not be rich.

And that’s valid for all skills - if you are only learning from successful (rich) people you are missing out big time.

e.g. one of the best software developers I know is just a guy who works as a regular developer in a regular software firm. He cannot/does not want to manage anyone.

e.g. the best bike mechanic I know runs bike shop, that is only a moderately-popular (unfriendly location, and no marketing, except word-of-mouth)

e.g. just went to work out in the park, and started talking to an old guy who gave me some very good advice - turned out he was a former professional athlete.