If I was going to mars I couldn't in good conscious go on a mission where they were going to bring me back. It simply would not be worth it. The money it would cost to bring me back could save many lives on earth. If we define "saving a life" as giving five or more extra years of life to someone who would otherwise die, then I would estimate that used properly the money saved from not returning me from mars could save a vast number of lives hear on earth. More than thousands. Judgeing from my actions so far, I value my own life as worth more than the lives of 500 complete strangers, and I'm quite comfortable with that figure, but more than thousands of compete strangers? Nah, leave me on mars.