My opinion for what it's worth is, that if you take off, and can't land were you had intended, for whatever reason,you cough up the landing fee, whether you like it or not. It was your choice to depart in the first place, you could have stayed on the ground if the weather was looking dubious.Could the "free" landings encourage more people to take the chance and go, knowing it won't cost so much for a diversion.