The case for why survivor should only allow idols to be played on other people not the person currently holding it. 1. It prevents the ever more common just find idols and get to the end of lone wolfs.

2. It adds a social strategic element.

3. It allows for the minority tribe/alliance to come back without letting people who are completely on their own "cheaply" make it.

Thrice is enough of seeing the idol to the end. Its survivor not pirate master, this aint a game of treasure hunts.