I tell you, the difference for me is between being victimized, terrorized, numbed by reading about different disasters, or reducing the anxiety by getting up and doing something about it, at whatever level.
If I feel I'm not influencing games, not scoring goals or making goals, then that's the time I'd pack it in.
My family has been around campaigns for a long time. It's something you really have to be sure that you alone want to do. Because if not, if you don't want to do it, that will just blow through the surface at some point, and people can tell. And when people can tell, it's all over.