The games market is pretty small but vigorous. One supplier of games for that other OS ported a game to GNU/Linux in six weeks and published the web-stats that resulted. They claim their investment in the port was repaid and sales/downloads continue. Their estimate is that 15-21% of their gamers use GNU/Linux and the release of the GNU/Linux port caused a spike larger than that for the MacOS and other OS versions. So much for the 1% number… I think that gaming is fairly OS-independent test of popularity. No doubt some GNU/Linux users bought the game just to wave the flag, but I doubt that. I would not, but then, I am no longer a gamer.