Talking about ethnic cleansing in Kosovo may be too insensitive for a comic book. But ethnic cleansing in the fictional Slorenia is ripe for an intervention by Force Works. You can't really have Iran creating mechanical terrors to plague their neighboring countries. But Bialya is completely free to launch super-powered attacks on Kahndaq. It's politically correct, safe, and just makes good sense for a developing story. And it's fairly easy to create a country when you do so in regions that are nebulous to your America audience like the Middle East, Africa, Eastern Europe, and east Asia.
But making up fictional countries willy nilly is bound to have consequences. These new countries are additional economic variables added into the equation of Marvel or DCs fictional global market.
The techno-tribal monarchy of Wakanda is the primary source of vibranium for the Marvel Universe. And vibranium has all sorts of uses from making unstoppable shields to making unstoppable robots and other generally unstoppable things that may or may not be sentient and angry at humanity. This makes Wakanda an important nation that has a great effect on the global market. But because Wakanda is a fictional country which provides a fictional resource to the world, it's nearly impossible to calculate the effect Wakanda's creation has on the world economy. Granted, calculations could be posited and international trading agreements (likely between Wakanda and a nation that wants to use vibranium to make something unstoppable) could be postulated but the accuracy of such calculations would be flawed without a real world equivalent to base them on.
And Wakanda is only one small example of this process. As time goes on, writers continue to deform the geography of the comic book world, and with it the fictional global economy. International defense spending likely increased after Dr. Doom's Latveria was made and Black Adam resumed control of Kahndaq. The creation of these nations has far-reaching consequences for the comic book global economy. And yet writers continue to invent these countries with wild abandon. And I will greet each new comic book nation with the particular brand of mock outrage expressed above.