Here, I think prosecutors are relieved when they can assign the case to someone else. The really "good" or horrible cases aren't fought over because, as prosecutors, their lives are consumed with delving into the minds of evil people. It consumes them in many ways. Senior prosecutors take turns answering calls on the weekend ... in case police need to touch base because there's a serious crime. The case is then assigned to someone on the team.
Maybe it looks like children vying for the big ones, but I think that it's possible that after the first "good" case, they are relieved when it's passed to someone else ... at least, around here.