No I have not. I briefly toyed with the idea after stupidly buying a game in another country and discovering it was region locked, but I figured it would be easier to just get the damn thing through steam.
Honestly, why do you even feel the need to ask? And then you decide to specify PC gamers only. Why? That's like saying "Bleach fans, have you ever pirated episodes?" instead of just saying "Have you ever pirated anime?"