I don't support it

Since this is a privately paid bounty, the "donator" should be free to have whatever rules he likes to have. If he still wants to give the bounty to a winning player, to donate it to lottery/Grand Final pool, roll it over to next tournament or don't pay nothing in this scenario, should be up to him and not forced by some general rule.
We should be happy that people add more money voluntarily and not "bully" them

The guy who is awarding the bounty has the full right to pick anyone or apply any rule. Who was the other guys last week with me?