People pirate things because they can. It's cheaper and less risky.
Things that are pirated are usually not bought anyway, so it's not a big deal.
Piracy gives companies a way to market their company in a very strong way, and spreads word of mouth and strengthens brand (if the game is actually good).
If the game is not good, then it would harm the game's and brand's reputation and cause even fewer sales later on. Either way, if you release a bad game you will pay for it, whether through piracy or other.









