Because not everyone has a nice check provided by exploiting nearly every other country, civilized or otherwise. Just because you forced your asinine copyright laws on the rest of the world doesn't mean shit ethically. If you actually wanted a discussion, you'd be fighting TPP, not forcing more bullshit protection laws for rich countries.
Also, I couldn't possibly name a AAA publisher, and very likely any at all, who hasn't seriously pissed all over consumer rights, and many on free speech, so they can go fuck themselves on principle alone.
Having said that, I do buy nearly every PC game I play because, guess what, Steam and other distributors actually have a fucking clue about their costumers and sell to the long tail.
As to the developers, they're salaried, and their not treated like shit because of piracy, that's for sure. Fix the industry, maybe then someone will give a fuck. But no, it has to join the RIAA and the MPAA in fuckitude. They could all vanish for all I care.