Speaking to Gamasutra, PCGA president Matt Ployhar said that the increasing popularity of MMOs and the rise of casual games had led to a drop in unlawful distribution.
"The only PC gaming business models that existed and continued to thrive and that could continue to live were MMOs," he said. "They do really well. You can still pirate them but they're an order of magnitude harder to pirate.
"And then there are free to play games. You can't really pirate free to play. You can but it doesn't make a lot of sense. So what's happening is game design is shifting and as a result of shifting game design, piracy, at least on the PC side, is actually declining as a result."
It was previously reported that the PC edition of anticipated shooter Crysis 2 was leaked onto the internet, forcing developer Crytek to issue a statement condemning such practices.
Ployhar added: "I'm not saying that piracy is going to go away. It's fascinating to watch. For example, you get a game like Crysis that got hit hard by piracy. Now what you're seeing - to combat that or reduce the chances of piracy - are developers implementing achievements, in-game pets, all of these things that are tracked and stored in the cloud.
"So even if you pirate the game you're still not getting the bragging rights. You've got all these additional mechanisms where the value proposition of the game, where if you pirate it, it's just not going to be as fun."