Yeh, I reckon its cheating too but as you said it is a game and a big weight loss the following week will give them more of a chance to stay in the game. Once one person did it, everyone else followed, they were like sheep. I think the trainers actually suggest it too them. I think the problem with the Aussie series was that it was taken too far. I'm pretty sure they did do it in the American series but not to the extreme the aussies have done it.
I was glad to hear Ajay say that anyone putting on weight from now on will instantly be below the yellow line - that soon changed their minds! I think next series there will be a rule about putting on weight eg. you will be automatically put up for elimination if you put on more than 'x' - they'd have to allow a little leeway for fluid retention etc but not too much.