Mars One, like Bitcoin, is a scam.
Mars One depends on private funding. The plan is to raise billions of dollars by airing a reality TV show. The problem is that the average TV viewer isn't interested in space colonization. The average reality viewer hasn't even heard about Mars. But even if the Mars One scammers somehow managed to raise a couple of billions, they still wouldn't have nearly enough to fund a one-way-trip to the red planet. You see: Space is a hostile environment. No human has ever been further out than the Moon. Mars is thousands of times as far out in space. There is currently no life support system capable of supporting human life for such prolonged travels. Nor is there a system for doing Mars-based agriculture when/if the astronauts finally manage to land on the martian surface. Nor is there a system for distilling or synthesizing water if they ever land on said surface.
Oh, and there aren't any propulsion systems capable of propelling such a huge vessel all the way to Mars in an acceptable time-frame either. Plus, there're hundreds of other huge engineering problems. The total cost for actually achieving something akin to the Mars One project, would be on the order of hundreds of trillions, not billions, of dollars. It's well beyond the capabilities of the entire world, let alone a silly reality show with, at best, a couple of million viewers.
And history has proven that humans don't get along very well then they're forced to stay together in cramped compartments over extended periods of time. Remember: In Mars One, there would be no escaping. You'd be forced to get along with all of your co-astronauts -- for the rest of your life. Every waking moment you'd have to listen to their nagging and watch their faces. Wouldn't that get on your nerves pretty soon? How would that make you feel, knowing that you can never return to Earth, never see any of your loved ones again, always just forced to share a tiny room with three people constantly getting on your nerves? While all the time, you all know that there're only a couple of inches of metal and composites separating all of you from the deadly, cold hostility of space?
The hypothetical astronauts would end up killing eachother well before they were halfway to Mars.
If you believe that Bitcoin is a scam, then why are you here? And where are you getting the trillions of dollars figure for the Mars One Project? There are plans to establish modest sized colonies that won't cost much more per "mission" than what the Mars One plan is calling for. Elon Musk was once quoted as saying he thinks he can get the cost down to something like $500,000 per person -- basically about what some people pay for a good house.