90% of their oil revenues would be gone. How would they finance their nuclear program.
The goal is not some oil or finance scheme, but world nuclear war to kill off millions or billions which will bring their 12th Imam out of the Well he climbed into 1000(?) years ago. He will then lead the glorious Islamic armies to conquer the world by killing everyone - with the last two living humans obliged to kill each other and so bringing everyone to Paradise ... The Iranian Mad Mullahs are called mad for a reason.
You are no longer in the Western world ... welcome to the Middle East.
Key Word - religous.
As long as the Mullahs rule Iran, Iran will be at war with Israel.
The Korhaan demands that the faithful make war against and kill Jews. That a Jewish state exist is intolerable to the Mullahs. The Mullahs will starve their people if they must to make war against Israel.
The war with Iraq nearly wiped out a generation of Iranian youth. The war against Israel could wipe out half the population of Iran and the Mullahs wouldnt blink because they would all be martyrs.