Earlier quoted context omitted.
I'm not sure that the people who want one of those will want them if: * they are not the first (or in the first ~50 or so) to get there * they have a lot of money and a lot of income on Earth This is kind of a glory-seeking thing for people who haven't made a name for themselves otherwise. Rich people would want to have a return flight. That is not a recipe for making a ton of money.
think of it this way: you go there, work for a company, in a spare time, you find gold, raise capital to start mining it, got rich, build a huge house with swimming pools, and all the rich attributes, but on Mars. Mars will be colonized with great mixture of science and initiative people. Your kids will grew up in this environment, they'll receive best education and endless room for possibilities.
If you are already rich on Earth, you don't need to take risks that insane to try. In other words, nobody who can afford a ticket to Mars will pay for one.