I pirate games to see if I like them, after a few hours I decide if I like the game or not. If I don't find it's worth my money I will delete the game and not buy it, but if I like it enough to buy it I will.
I bought over 250 games on steam and ubisoft will include me in their statistics as a pirate even though I wouldn't have bought any previous AC or FarCry game (I bought AC 2,3,4 and farcry 1,2,3,3BD after pirating them).
They don't know if I delete a game or not.
I played unity and it wasn't even worth the space on my HDD so I deleted it.
Most of my PC gamer friends do the same (although they buy less games). But almost every console gamer I know never payed for a game in their life.