[joncrane]

I know this is going to sound controversial, but I think some of the most successful people in the world are the ones with the most stable emotions. Some people are able to harness what emotions they have, and damp the rest (or damp them most of the time). The most successful and "happy" people I know are the people that remain the most neutral (with slight positive affect).

Also I think this is why sociopaths are so successful. I believe they are not subject to the strong ebb and flow of emotions like myself and the person I am responding to.

Also I'd like to state that some exceptions are entertainers/sportspeople as many of them are notoriously mercurial but overall they are still largely successful enough at "harnessing" their emotions to profit from it.