To know the best bounty program the first thing to know is the volume to be distributed, the percentage to be distributed know the best campaign to follow and how it will be distributed.
Those all you said are totally wrong, wouldn't suprise if you are one of those people who got demoted to newbie rank. You can't know which best bounty, even though it managed by reputable managers. You can only minimize the risk to get scammed by looking at their dev