I feel bad for them but it's their fault for not doing a simple background check about the manager/project.
I am pretty sure those hunters does not even know how to look for a good project, at least have a good future. They hear something from their friends or on the web and think this is their opportunity to make free money. Then there is another thing, I have seen many projects to rug poll. Everything looks good but at the end after having a good presale they simply abandon the project.The manager can make the campaign more professional, but he can't influence whether the participants will be paid in the end - unless he gets those funds in advance, which I don't think is the case with bounty campaigns. Here's how a bounty campaign with a reputable manager ended.
That's true as well. I know Hhumpuz is a great manager among with few others. I am not sure how they do but if I would be interested in campaign management then my best try will have the tokens in my possessions. 
