If real rich guys or humanity were to simply invest that money in sustainable infrastructure we could re create the earth in a healthier and more abundant way much faster and cheaper than colonizing mars.
But hey theres more money and fame to be made from spending it to do something sci-fi ish and cool.
I am very disappointed in humanity. I hope people realize the implications of what I have just said and re focus on what is truly important. Our life right NOW∞§∞