It's a heavy cost, and yes, I believe it's fair. If you break an armistice you put all members into war. Which means they burn resources and fight because someone thought they would be funny and loot. So, for the risk, you compensate them for what you would force them to lose. That, and if you bring us to war after being told not too, then the measure is to make you weaker for it. It's a team concept, and it's the chain. We are all in it together.