At the end of the season, one player is named the "brightest star in the galaxy," and they alone win Stars on Mars. It doesn't look like there's an actual monetary prize for who wins Stars on Mars. However, the title alone and the "bragging rights" may be enough to keep some of these competitors on top of their game in the inaugural season.
And, since the cast of Stars on Mars is made up of celebrities, you have to expect that they were paid for their time on the show. Throw in the potential title of being the "brightest star" among them and it's anyone's game.
Watch Stars on Mars on Mondays at 8 p.m. EST on Fox.