[Jack_]

At first I thought that was interesting but then I realised if they were all smart enough they'd sit down and agree to press the button straight away as soon as it starts decreasing, nom someone, hit the button again, repeat repeat repeat so that barely any money is lost at all.

That way the winner still gets nearly the whole prize (barring more inevitable stupid twists) and I mean the money is more important than having to nominate someone which they'd have to do anyway.