As with most "secrets of the successful" bumph, there's a stunning survivor bias there. It's like interviewing NBA athletes and finding out that they all followed their passion and spent a lot of time playing basketball. Yeah, and so did all the guys standing outside the liquor store on Slauson. I especially liked the "acquire specific knowledge" one. A little 20-20 hindsight there, maybe?
But, but, thanks for the link, arebelspy, even pissing me off makes me think...