Why not Mars
SpaceX's announcement: https://www.spacex.com/updates/inspiration-4-mission/index.html
Mission website: https://www.inspiration4.com/
The flight, dubbed Inspiration4, is being paid for by Jared Isaacman, of Shift4 payments. He's taking three other people with him. The seat dubbed "Generosity" is being raffled for donations to St. Jude Children's Research Hospital. The "Hope" seat will go to a St. Jude ambassador. The "Prosperity" seat is a "Sign up for my company and tweet about it" thing.