I doubt that's all the winning that's possible. They just leaped hurdle number one, non-delusion.
I'm just saying that leaping that one hurdle is sufficient for the vast majority of people to take huge steps forward in their results. Outside of attempts to advance science or technology, there are very few things in life that can't be had with only that much "rationality".
This has been discussed some, but I don't think it's been the sole subject of a top-level post. I want to find out other people's ideas rather than driving the discussion into my ideas, so I'm asking the question in a very general form, and holding off on my own answers: