I've paid for World of Goo twice (When I first bought it when it came out, and once for the iPhone version).
I've also pirated World of Goo three times. When I switched from PC to Mac; when I gave my iPod touch to my sister and installed it on my new iPhone as well (does this count as piracy? I have no idea. Its the same iTunes account running on two devices now...). And once on my Linux box when I wanted the linux version.
Does this count as piracy? Probably. I think they even have platform-free redownloads. I can't be arsed. I've paid for it. When I want it in a different version, I'll get it from the most convenient distribution channel that happens to be the pirate bay.
I also own like 4 Windows 7 licenses. But my Windows 7 computer is running a pirated version because:
1. I lost 2 of the license keys (the sticker at the bottom of the laptops burned out from heat). So much for that. I liked my home-premium install, too. But that's a non starter because the keys can't be recovered. I'm supposed to write down keys in case of this problem? What is this? 1999?
2. There are numerous version incompatibilities. 2 of my Windows 7 licenses are "academic versions" of Windows 7 unlimited because they ran some promo when it first launched that I bought. Apparently, despite being Unlimited, if you get the ISO off the pirate bay for the unlimited version, it doesn't work unless you have the academic version of the ISO. I have no idea how to get the academic version of the ISO, because the ISO downloader on MSDN academic is a Windows-only program. (At the time I had no Windows computers --- I was trying to get my first Windows 7 install up!). SO I got the same ISO from the pirate bay (the only place to get hassle-free ISOs). It's important to note that I have Unlimited-edition licenses. It's not failing because I paid for Home-premium and am trying to run Unlimited. This is different versions of Unlimited. It makes my ears bleed just how many different incompatible versions there are.
It's just a confusing mess. I'm sure I count under the piracy statistics as a pirate user. But in reality, I have 3 computers, two of which have Windows 7 installs, both "pirated". The fact that I own 4 licenses, none of which I could manage to get activated, won't come up on the statistics, will it?