Well, it's more of a pyramid scheme. You can send more people to mars than you can send back to earth. So nothing prevents Elon Musk from sending "100" people t

Well, it's more of a pyramid scheme. You can send more people to mars than you can send back to earth. So nothing prevents Elon Musk from sending "100" people to mars and 10 person back. Then the people who want to return can lie about how awesome it is on mars and convince more of them to come to secure their own return trip.