If this were the actual market at 3x the price, there would be massive plays into this to drive the price to equilibrium on arbitrage profit. But you won't see this really since it doesn't exist.
It's kinda hard to actually benefit from any sort of premium in countries like Iran, Venezuela, etc. The actual liquidity is so thin that you probably will waste more time than actually make money waiting for your orders to get filled. Every 1BTC you add to the ask pool will significantly increase the available supply and tank the premium hard.
Also, what we consider premiums are premiums over our spot price. For people in the aforementioned countries these aren't premiums, but their spot prices. There just isn't a way to acquire Bitcoin any cheaper. Not saying it's totally impossible to arbitrage back and forth, but people's glorified idea of arbitrage trading just doesn't come to fruition here. Can't make it sound any better.