See http://www.fortressofdoors.com/2013/02/steam-linux-sale-results.html http://www.fortressofdoors.com/2013/02/steam-linux-sale-resu... They may just got luck

See http://www.fortressofdoors.com/2013/02/steam-linux-sale-results.html http://www.fortressofdoors.com/2013/02/steam-linux-sale-resu... They may just got lucky, but ~7% of their total sales comes from users running Linux. While it's not an huge number, it's still significant, and it's likely to grow in the future.