Ah, but there is one refuge for us polymath-misfits: being an entrepreneur! You HAVE to have a working knowledge of marketing (and thus practical customer psychology), finance (even if it's just a shoe-box), whatever the skill-set you need to make the product you're selling, basic business law, and a long list of other skills. By the way, I take great encouragement from "Pareto' Law" applied to knowledge. Pareto's Law is the '20% of your customers account for 80% of your sales', etc. How about this: 20% of a doctor's knowledge covers 80% of the presenting cases. Now to hang out your shingle and actually treat people you need to have much better than 80% knowledge. On the other hand, for us polymaths, it suggests that if we learn that 20%, we would have 80% competency in the field, which is not enough to be a card-carrying practitioner, but more than enough to know the jargon and issues of that field and intelligently link them to other fields where we also have that 20%/80% knowledge.