This is just a layman's observation, but Mark Cuban seems to be more down to earth and when he invests his money and/or time, he invests them into something that is real and conceivable. I don't quite understand Richard Branson's desire to invest his money and/or time into space travel. Creating a space travel program is a great idea, no doubt about that, but if he happened to ask for my advice I'd come up with a dozen of projects that he could invest that money in that would actually help a great deal of people. The last thing that the world needs today is a space travel program. Who can afford it anyway? A few rich folks?