I read a study that was done in Quebec, Canada that showed that there is a direct correlation between the amount of money someone makes and their levels of happiness, with the rich being the happiest of all.
This matches my experience, in that all the millionaires I've known or worked with were all VERY happy, passionate, evolved and fun-loving people. The most miserable people I know are also the poorest.
There you go!
What are your thoughts?