The success of a bounty project is not in the hand of a bounty manager, the ball is in your courts, you are responsible for the bounty projects you choose, if they fail it's never bounty managers fault. Always remember this.
But, there are people who are choosing a bounty program is just a because of its managers. I mean they are just leading off the responsibility of finding the right bounty programs into its managers. Because managers are highly reputed people of this forum and when you are following them for working for good projects in the past, then people are usually is aiming like they will choose only right project to work with. This is the reason people are blindly start working into a project which is managed by highly reputed people of this forum.
I agree it is still responsible of bounty hunter and definitely not into the shoulders of managers. But, this can change case to case regardless of reputed manager managing project or not. I have seen even good manager handled project had gone scam after some time of being successful in exchange. So, believing into a project just because it is being manged by highly reputed manager also may lead to disappointment.