That's what I was speculating about, that countries without their own currency would be stuck with whatever the standard Euro price is regardless of how low their average income is. But again, that bit was just speculation rather than an "argument".
That's simply how Steam works. Those countries need to have some kind of currency if their own isn't supported, so they get Euro which makes the most sense (not economical sense, but still). There actually used to be two Euro price tiers, one for richer EU countries and one of poorer EU countries. The idea was dropped after some time though because vast majority of publishers set the same price for both, few set the second one lower only by 2-3 Euros which had negligible impact, few went full retard and set it even higher than the first one and very few actually set it for something that'd make sense.
Even when it comes to boxed copies your argument falls flat because boxed games in Poland are cheaper by 15-20 Euros on average, though they used to be much cheaper a few years ago. At this point it's usually cheaper to buy a new AAA game from GMG than to buy local boxed copy which used to be unthinkable.
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