But "If you're so rational, why ain't you rich" is sneaky-good and similar enough to hitch a ride. It asks: maybe you aren't rational enough? And suddenly a scale is introduced.

An interesting data point: those who are rich (powerful, successful with the appropriate sex, etc.) are usually those who are willing to accept unpleasant truths regarding what is required of them.

It is generally not necessary for such people to actually discover or work out those truths, since most of them are readily apparent, available in books or other educational material, and of course learnable via "hard knocks".

So, the rationality that "wins" the most (in bang-for-the-buck terms) is not so much being a perfect Bayesian or smart reasoner, as it is in the willingness to accept potentially-unpleasant truths, including those that violate your most cherished ideals and preferences about the way the world should be.

(And unfortunately, the people who are most attracted by the idea of being right, are usually also the people least willing to admit they might be wrong.)