Piracy, as many other things, has their pros and downs. In terms on games, I think is better to play a legal copy rather than a pirated copy, the gaming experience is better, plus some pirated games don't have multiplayer like the ver from Black ops or other steam required games.
Although piracy have helped companies,my fav example is anime, fan subbing was considered piracy, until the Japanese marked in terms on sales regarding the products related to that anime increased on US, Europe and Latin America, etc. Most anime fans liked to watch the series, they create a huge fan base to buy their toys, shirts, even limited ed dvds before they where translated by a company of those countries. Thanks to that, Anime directors and makers don't complain w/ fan subbers, they even give them copy of their anime for Example Thora in English and MCanime in Spanish :)