Since I got back into PC gaming last year I haven't pirated anything (games or otherwise) and I have bought several AA/AAA titles. I even bought a legit copy of Windows (the first time I've done that in my life).
The fact is, 15 years ago when installing Windows 95 and Quake 2 required nothing more than a keycode for full functionality I would never have considered paying for software and I never did pay for any. Why bother?
Now though, DRM makes pirating more hassle than it's worth and digital download services make legit purchases quick, simple and often very cheap. Torrenting is more effort than hitting a few buttons on Steam. Legit copies don't have nearly as much hassle with patching, getting online play working, worrying about viruses and trojans etc.