Happiness/Risk Correlation
I suspect that there is a correlation between how risk averse an individual is and how happy they are. Happiness seems to derive from a certain satisfaction with the status quo. If one is satisfied with their lot, and therefore happy, they are unlikely to take substantial risks even if they may lead to significant gain because satisfaction negates motivation. The unhappy, on the other hand, are probably more risk prone because they have less to lose emotionally. They are unsatisfied with their current position so they will be more likely to risk whatever they have in a bid for what they perceive would make them happy. Just a theory. I have no proof, evidence, statistics, or even anecdotes to support my claim. Scary...it's almost like sociology ;-)