What is the deal with "The Gauntlet" on MTV?

Is it just that the people who were on Real World and Road Rules can just keep coming back over and over to compete in this game? I just happened to see it while flipping channels, and some of the people on there are from when I used to watch Real World, which is now several years ago. Do they just postpone growing up and leading real lives for a while to be an MTV reality star?