Yes you do =/ studies have shown that piracy doesn't decrease sales...
Also I wonder how long before companies realise that PC gamers can get around any of these measures eventually and that all this will do is fuck off the people who legitimately buy the game.
If I go out and pirate Spore instead of buying it, I just decreased their sales. I stole it instead of buying it.
Now if you want to argue that the people pirating would never have bought the game, then file. It doesn't decrease sales in that respect. It is, however, still illegal. If the game companies don't do anything about it, then the government should.