It was that way for a while, but I don't think you can sell Iran stamps at all now.
As of last week, the "Stamps > Middle East > Iran" category was removed. There are only a tiny fraction of listings with the word "iran" in them as there were before the category was removed. Some sellers are using things like "iran1" for the country to get around the removal bots.
There are a grand total of 236 listings across the entire stamps category with the word "iran" or "iran1" in them, where there used to be thousands.
It's only a matter of time until
ebay tweaks their bots to scour all of the categories for listing removal.
Same thing with Cuba, virtually all listings have disappeared, with the remainder using "4cuba" or "6cuba", etc.