A couple of times bounty manager is the one who was being blamed for the unsuccess projects. Not realizing that bounty managers are just doing their job whatever the owner wants him to do. And it is true that bounty participants are juat joining any ICO or any signature campaigns without further realizing that it is not worth to join for.
Being a bounty manager isn't an easy job. Reputations, good image, efforts and time are needed and I understand where OP is coming from all of his sentiments.
Bounty managers capability is of different types, few bounty managers on this forum cares about their reputations and they do research before approving a bounty project but some bounty managers are know for always introducing bad projects, I'm not going to mention names but this is true
But the central capability from the managers must be to make sure if the participant was getting safe too. There was a lot of differences between bitcoin campaign and altcoin campaign manager. The majority of managers who are introducing so many scam projects are coming from the altcoin bounty as they wanna look like they are reputable enough to manage the campaign. Still, they don't care about the quality of the campaign. Those altcoin campaign managers should have been putting more responsibility to make sure the quality of their projects.