It’s pretty simple, Mars One intends to put humans on Mars years ahead of NASA. But there’s a gotcha: Their plan doesn’t include bringing any of them back.
If you’re chosen to go to Mars, you’re on a one-way trip. You’ll be famous, but you’ll never have a chance to enjoy the benefits of fame. When you die, it will be far from the planet of your birth. Yet 200,000 folks applied for the 24 positions anyway.