An iterated game will tune emotional responses to achieve the same end.

Draper has no doubt had many chances in his life to provide negative but true and positive but false comments on his investments. If society punishes negative but true comments he's damn well going to notice and make fewer of them. If society further fails to punish positive but false comments about his investments, he's not going to invest the mental resources that would be required to avoid them.

A little experience substitutes for a lot of strategy.

What do you mean, "than the rest of us". That's how I think, so I have no reason to believe that other people can't do the same.

How sure are you that you really think that way? Most people make decisions based on emotion and intuition, then rationalize those decisions after the fact and fool themselves into believing they were rational from the start. Since human memory is so unreliable it's almost impossible to accurately determine which decision making process you actually followed.