Those Iranian sanctions aren't for show. I don't think the Iranians share your perspective at all. They're brutally crushing the Iranian economy at the moment and causing the regime to lash out aggressively. The Russian sanctions are more reasonably in the for show category by comparison.
Their oil output has collapsed by 50%, from roughly 4m barrels per day. Their currency has lost 2/3 of its value versus the dollar and is near record lows. Inflation has skyrocketed, around 30% in 2018 and perhaps 40% in 2019. It's hammering living standards:
"In the past 12 months, the cost of red meat and poultry has increased by 57%, milk, cheese and eggs by 37%, and vegetables by 47%, according to the Statistical Centre of Iran."
2019-04-29: "Iran’s economy is expected to shrink for the second consecutive year and inflation could reach 40 percent, an International Monetary Fund senior official said, as the country copes with the impact of tighter sanctions imposed by the United States."
https://www.reuters.com/article/us-iran-economy-imf/iran-inf...
https://www.bbc.com/news/world-middle-east-48119109
https://www.theguardian.com/world/2018/nov/28/we-are-despera...
https://www.jpost.com/Middle-East/Iran-News/Iranians-stock-u...