I want to buy cod4 on pc, but ive only got 30 bucks at the moment, on steam cod 4 is 50.00 dollars but on ebay it is around 30, so i want to if i buy it off ebay and not on steam, is everything fine, there arent any special steam servers or things that the game gives u if u buy it through steam, it may seem silly but i would like an answer pretty soon, thanks.