Simple hypothesis relating to Why Don't Rationalists Win:

Everyone has some collection of skills and abilities, including things like charisma, luck, rationality, determination, networking ability, etc. Each person's success is limited by constraints related to these abilities, in the same way that an application's performance is limited by the CPU speed, RAM, disk speed, networking speed, etc of the machine(s) it runs on. But just as for many applications the performance bottleneck isn't CPU speed, for most people the success bottleneck isn't rationality.