So, don't join a bounty or invest in a project because of the bounty manager. Do your research before investing your money or time on any project.
Don't feel bad if the Bounty Manager is not introducing a worthy project for you to work on, if HE is introducing you a scam project, it's for the sake of his name. They are paid by doing so, so do you. And bounty hunting isn't as much equal to investing, it is more likely gambling for me.