Why doesn't the dad give his daughter points when he's proud of her? When society has a bunch of different points systems like that, social points from each individual ought to be one kind of points system. It could help make trust networks, too.
Though given how many relationships break up over World of Warcraft, maybe points are better than love. (I don't know how many relationships break up over WoW, but I could imagine it's a few).
Are some things necessarily unquantifiable? Or is it just that people haven't found the right metrics yet?