In addition to the obvious 0 line, it's worth taking the article's observation that S&P has returned 7.8% and mentally drawing a line there too. Also, for anyone in the position of deciding which to do, I'd add the observation that it is way easier to go to college and get a formal education in science, math, or engineering, and pursue an ongoing adhoc self-directed education in the arts and humanities in your remain…
>it's on the short list of exceptions, not the rule.
As an example, I've fiddled around with circuit design. I'm not good at it, but I can make some basic stuff.
It feels a lot like fiddling around with linux early in my career, and I'm not seeing any obvious point where it suddenly becomes more difficult to learn the skill.
It's just a bit harder to get into, and a bit harder to get on-the-job training/mentorship.