It's not Iran only, there are other nations: China, Russia, and Pakistan. Maybe there missiles are in the depletion phase; however, when one compare everything with the economical lense, USrael, both has suffered more. Of course Gulf states too. For Iran, the war is more psychological; the more they can hold, the more they are putting pressure. Iran is/was already sanctioned, so they are used to it. One more thing, they have already neutralized the top-tier of IRGC - even the supreme leader - yet no significant change. The offenders forgot to read the history as well as their present status. Even if they kill the new supreme leader, nothing will change at all. They are the one who love death as much as life.