"Again, people shouldn’t make decisions based on past investments."
This works for poker, but doesn't really scale to things like a college education. I've invested two years into a B.S. in CS, took off a year, and now I'm back at it. And yes, the decision to go back is based on my past investment.
I suppose I just don't understand parts of this article. What's the point on giving advice if you just say "Always make the best decisions". Be perfect and then you'll.....be perfect?