I often wonder about this in the context of musicians and actors. You would have to be a fool to pick such careers, as the prospects are so dim. Yet because of this dimness the selection pressure is very high on the pool of contenders. So our best actors and musicians are fool/geniuses.

Which implies the most innately talented potential musicians and actors are working at a hedge fund or Google DeepMind. And perhaps the odd personalities of musicians and actors is more to do with the bottlenecked selection than some relationship between talent and impulsivity: Only the egotistical and impulsive would step into such fray.

And so we are left not with the best but with the best of a bad lot!