To me, I think it has to do with amount of buildup or anticipation of winter storms and the nature of winter storms themselves. For severe storms, I think most of us going in know that on any given chance, some get them, most will not. It is what it is. Plus severe chance isn't something you spend nearly as much time tracking and analyzing (or at least pretend to know how to). Just check on it, "cool there is chance" and move on. It is much less of a time/emotional commitment for most I think.