All of them get installed and replayed when I have time to, so they all count. The only reason they may sit un-played on my hard drive is when I don't have time to play any games at all. They all don't get played all at once and all of them take tours on my hard drive. None of them are in permanent residence though (no game resides on my hard drive for more than 6 months).
I could actually add to that list too, but those are the ones that reside very frequently on my system (Reinstalled 8 or more times) or stay for very long periods on my drive (x3 for example).
Normally I only keep 4-8 games loaded up at a time, and switch them around every month or 2.
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