Ok, so I'm going to give an example even easiest to understand! You said that we can't compare soccer with poker because poker is a mental and not a physical game, so: In this picture you can see Wich country has the most chess champions in the world, the first one is Russia, it doesn't mean that if you were born in Russia you will be a chess champion, but you can't deny that in that country exists more people who play better chess than in other countries, it's the Real Life, I'm not trying to be racist, nationalist or fascist, I'm just showing the truth, and this happen not only in chess, it happens in all the sports, in science and even on technology.
It depends of the culture of the country, the traditions, education and a many more factors! As I say, I'm not being nationalist, just showing the truth of THE REAL LIFE
That's the link that I made the screenshot, but you can find more information in any page.
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Which countries do you think have the highest numbers of GMs and WGMs?
www.playmagnus.com