It's okay as long as game developers keep trying to milk you for more money via DLC, exclusive content, and rushed gameplay. It's better to pirate and test than to buy and regret. There are developers I don't ever bother pirating from: Bethesda, Paradox Interactive, Valve, and The Creative Assembly, because so far they've been nothing but consistent and faithful to their users.
Bioware, Ubisoft and Blizzard recently fell off that list for some of their recent releases and antics. Why pay them $60 (which is quite a lot of fucking money, mind you) for a game that has a good chance to be unsatisfying, include exclusive content, feel rushed, and have obnoxious DRM? It's better to find out if their games are actually worth it first before giving them your hard-earned money. As I see it, it isn't the studio losing out, it's me being safe. They're going to sell millions of copies anyway, but I only have a limited budget to spend on games, which are my favorite hobby. Why let cynical business practices ruin that for me?