>get game in a bundle
>get game for free from promotional code or some 'free to keep' weekend event
>get game for very cheap on a friend's recommendation
>just don't end up playing them for one reason or another
If you shrink down the sample size, it's really not a whole lot. Mind you, the "Unplayed" filter in your games library also counts other people's libraries if you're connected to them, it counts SDKs and Dedicated Server tools, and it counts betas that may no longer be playable that you haven't manually removed from your account.

I'm American; how's your petition going?