Well as we all know, to play HL2 you have to use Steam. This page here http://www.steampowered.com/status/game_stats.html says that there are approximately 2.2 million unique users of Steam per month. Old CS is still the most played game and probably accounts for a great many of those users. Personally, I'd expect at least a third of that 2.2 million to have HL2.
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