No kidding. I think I just installed Nexus: The Jupiter incident for the third time and Gothic 3 for about the fourth or fifth time (due to patching issues).
I know I've installed Quake Wars three times already, and have installed Wolf: ET about a gazillion times. (Yes, I know they're online games). But I'm sure either 3 or 10 is a nice round number for people who don't mind licensing their software.