I have probably pirated about 20 PC games in my life. I have probably played those a cumulative 10 hours, max, if you don't count Jade Empire, which I ended up buying because it actually piqued my interest.
I play very, very, very, very few games even close to completion. Most games bore me in under an hour. Pirating is literally a neccesary measure for me, or I'd never ever buy games that I wasn't 100% sure I'd like beforehand (for my PC) because I'd be too afraid (justifiably) that I'd never play it.
So in that sense, piracy has actually increased my purchasing of games (by 1).
Blank? Blank.