The cost doesn't really matter. The US led financial system (which is a glorified Ponzi scheme) is on an unsustainable path. The war in Iran is about resources (force Iran to use US dollars to trade oil, give US more leverage in dealing with China...etc.) and to delay the collapse. You build "digital pyramids" like AI data centers and consolidate power/resources while you still can. Financial cost of the war is largely irrelevant. Whether the outcome will be to your advantage is a different issue but pattern is predictable with historical precedence (Romans...etc.). Unfortunately innocent people pay the price.