Unconventional perhaps, but I'd suggestion professional gambler.

There are a number of top-level poker players who come from finance backgrounds. There is a bit of knowledge and a couple of developed talents that translate really well.

Comfortable with large sums of money / able to see money as a tool rather than a rent payment - High stakes players throw around sums of money that would make most people hugely uncomfortable. Put the average person a high stakes game, even with someone else's money, and they'd play terribly because of the emotion/adrenaline of the stakes. Many people from the world of finance are unaffected by the stakes, are able to see money as a tool.

Familiarity with important, advanced concepts. Top level players work with statistics, lots of it, as well as concepts like equity and ROI. In any given hand a player might calculate several different probabilities and both add and multiply them in various ways in order to deduce a correct action that will produce long-term success. There is the simple division that we use to calculate the odds of the right card coming, then more complicated calculations around our opponents hand ranges and what they'll do with percentages of those ranges on given future cards, and then combining those to figure out our equity in the current hand and then all of that is combined to figure out bet or all sizing.

Unemotional analysis - combine all of the above and you get someone who can play properly, no tilt, and objectively analyze their own game without bias to become a better, more rational player.

And, as long as you are at the casino... why not pick up a hot tip on a basketball game and drop a month's profit and a sure thing? Yeah, finance guys don't do that either... They make great 'gamblers' because the best proposition players don't take dumb bets.

Potential earnings range from "comfortable" to "obscene."