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WiiStation360 said:

Nobody buys PC retail games anymore.  Metro 2033 is estimated to have sold over 3.2 million copies on Steam.

Steam Top 100 Estimates from April 2014

They gave away the game for free though through their official Facebook fanpage.
http://www.eurogamer.net/articles/2012-12-11-thq-gives-away-metro-2033-on-pc-for-free

That's how I got my PC version and considering the Facebook page has over 1m likes, many others did so as well.

Also the THQ Humble bundle, which sold 885k copies and barely contributed to the revenue of the game. (same as selling ~15k copies at full price)