The 2+2 Hedge Fund

[illiquid]

Wasn't Jeff Yass an options market maker? Point being, the typical market maker would most likely make a horrible investor. Making markets and investing are just two completely different animals, and it's likely having experience in one is actually a disadvantage when attempting the other -- Warren Buffett would make a horrible short-term trader due to his prior success in long-term investing, not despite it.

Along the same lines, intelligence and prior success in one's profession does NOT by any means provide an edge in the markets, and may actually prove to be quite detrimental (and if you need to wonder why that is, you haven't tried trading full time). Anyways, I'd imagine that the most intelligent of poker players would have entered the markets a long time ago if their talents could so easily translate, the rewards are just magnitudes greater than anything that can be consistently achieved at the card table.