Good point - and without the oil?
Indeed, without the oil, there's nothing to most of the OPEC economies. This just shows how stunningly important is the War in Iraq. A secure, democratic, and free-market Iraq will thrive without the depency on oil of most of the others.
Iraq's per Capita GDP is $3,400 as compared to Iran's $8,100. If with all that oil and cash flow that's the best Iran can do there's something drastically wrong. As things gel in Iraq, its economy will soar -- with or without the oil.