'Not a hoax'
Bas Lansdorp, 35, made his fortune selling shares in his wind-harnessing energy company.
So far all the Mars One endeavours - including a quick trip over to get some advice from Nasa - have been self-funded.
"If you look at the team involved in Mars One, none of us would do this as a hoax," says Mr Lansdorp.
"If a Mars mission was to happen we'd want to be part of it and if we did a scam now and it didn't work no-one would ever include us in the real thing."
If this all sounds familiar, that may be because back in 2009 the Russians launched a 17-month Mars experiment.
The simulated flight conducted by the European Space Agency was designed to test the physiological and psychological impact of a journey to Mars.
But at the time, Christer Fuglesang from the Science & Application division of the ESA admitted it was no real comparison to the lack of oxygen or gravity levels.
The truth is it's hard to test what life would be like on Mars while you're still on Earth.
The fact that Mars One has recruited one of the original founders of the Big Brother reality TV takeover has simply given the detractors more ammunition.
But, Bas Lansdorp claims, "reality TV is an added component just to make it possible".