Regional restrictions to me are understandable, if you're unable to purchase a game/import it then I can understand pirating it.
However, if you don't have enough money for a game, you shouldn't pirate it. I often don't have enough money to buy things/games that I want to. Do I go in to a shop to steal an Ipad if I don't have enough money for it and I want one? No. Do I download a game illegally if I don't have the money, no. Most people can prioritise buying one thing over another, and if they chose something else they should not have a game.
While there are people who preordered being impatient, and some people who don't have enough money pirating (they would not have bought it so aren't a direct loss I guess) there are people who pirate games because they want to spend money on other things. NOT because they can't afford it, but because they can get it for free.
Piracy being eliminated would increase sales in some form, even if it was a small number it would increase sales.