Plus there's a huge number of people who go through a piracy 'phase'. Usually to get games when they're a teen with no cash. Most of the games they love are purchased once they've matured with a stable income.
Speaking from experience!
We were fortunate to benefit from a program meant to help get lower income families access to computers and the internet, in the early 2000's, so piracy opened up entertainment options far more diverse than the TV channels we could get over the air. On top of games, I remember burning music CD's for my friends and family. Hell, I remember long hours fiddling with the concept of transcoding and burning VCD's (basically a DVD, but on a CD) for my family to watch.