I think it's not so much a matter of making the idea of a bounty hunter palatable, because there are a lot of people who won't find that concept acceptable no matter how you present it, but rather bringing the bounty hunter into focus and making that character dimensionable (not necessarily likeable, but understandable). I've already written out why the system seems scary to me...but that's okay. A sense of dread adds to the suspense. And the potential for something to go wrong has to be there...otherwise, what is the point? If all is smooth in bounty hunter land, why would I read on? If it were my story, I'd work on the main character and the story line and not worry about trying to sell the benefits of the system. Let the reader decide how they feel about this world view from the evidence you give them. Trust that they will bring more to the story than you put in it. But that's just me.