As long as people keep buying as much games it's okay IMO.
Most of the times when i pirate games it's to try a game i wouldn't have bought otherwise, either because i'm not that interested in the game at first glance or i don't have enough money. As piracy made me interested in IPs i wouldn't even have tried otherwise, i would say it's pretty beneficial (for example i bought borderlands 2 after getting a pirate copy of the first one).