> There's the old paradox about self-help gurus and how they're rarely successful because they take their own advice, but because they get paid to share their advice...

That's not a paradox. It's plain old fraud, or to put it mildly it's marketing and self-promoting. The self-help gurus that get paid are those who convinced people who see help to pay them instead of the next guy. What gets the foot in the door is not substance, but the illusion and promise of substance.