It wouldn't work if it was explicitly known. The others could just as easily decide to cut him out of the distribution entirely.
Yes. Or if the victim could commit to not yielding to threats like this beforehand. Being able to commit oneself is of huge importance in games like chicken (http://en.wikipedia.org/wiki/Chicken_(game)).
Depends. Perhaps somebody would try to bully (i.e. play a game of chicken http://en.wikipedia.org/wiki/Chicken_(game)): "Either you lower your share in my favour, or I will claim too much and you get nothing."