The way you phrased your question at first sounds like why don't they just buy NA version and play on NA servers.
Server costs could be much more expensive over in EU than NA, to cover the costs of server, GM, maintnanence, etc.
This issue is also something you really need to be learning economics to understand why they charge things 49 euros and ours costs 49 dollars for the same item.
Its actually not. When you take into consideration the tax rates, the currency conversion, import/export tax, misc taxes you pay, You are actually getting it quite cheaper then the US.
2. Russians can't play in NA
Why Europeans have to pay more? Answer is 3 words long: Value Added Tax(VAT)
After seeing how Frogster handled the Sneak Peek event this weekend, I can't imagine why anyone would want to play on their servers. I hope for Europe's sake that Bluehole can find somebody competent to host their game over there.
You save a few cents at the cost of possibly huge lag issues. Why would you do bother to be that cheap? Not to mention, most banks charge a fee every time you convert to foreign currency, so you might not be saving any money at all.
59.99 EUR = 78.8875 USD
79.99 USD = 60.8284 EUR
Base monthly price (without discounts)
12.99 EUR = 17.0820 USD
14.99 USD = 11.3991 EUR