I hate how the $ to € is converted in Steam

No I hadn't heard about the big mac index but I fail to see how it enforces your point. The op is complaining about the price difference between different regions which is a by-product of Steam not following the exchange rate. Also what is there to understand? You're saying Europeans make more money than American citizens so it's OK to overcharge them. Yes, I find that idiotic to say the least.

For those who don't want to Google, the index registers the prices of a Mcdonald's Big Mac around the world so that it can be compared to the US dollar. The Economist started using it for shits and giggles in 1986.

There's just one problem with this index: it doesn't take into account salaries. Switzerland for example has higher salaries, but the price of a Big Mac is through the roof. Its price is apparently 65% higher than in the US, but I can assure you I don't make 65% more than an American dude with the same job I have.

And this applies to video games just as well. You take my salary after taxes, you take someone else's (hopefully that guy would have the same qualification I have, would work in the same field and would perform the same task, etc.), you make him work in the US, and you compare how many Borderlands he can buy, and how many I can buy.

I don't know what's gonna turn out but I'm thinking I'm gonna get ripped off. Even the average Moscowite, with his insanely low video game prices, can't buy the same amount of MW3 an average Californian could buy.