I thoroughly enjoyed playing the International Oilman Game with my wife, my son, and his girlfriend recently, but its gleeful capitalism reminded me of an important idea I read somewhere: 
nobody gets rich on their own.
In other words, it's a good reminder to me (especially in Canada) that my access to health-care, education, and infrastructure all contributes to a quality of life that enhances my success. Yet another reason to keep one's greed in perspective.