On the other side my friens, you have it all wrong. NVIDIA specifically worked with valve/steam specifically to time the new NVIDIA driver with the beta release of steam for Linux. So, contrary to your statement your wrong. As NVIDIA believes Linux is important to their image.
The latest NVidia GeForce driver, released yesterday, gives Linux users ‘double the performance’ and ‘dramatically reduces game loading times’, according to the company’s press release.
Having been in development for almost a year, the GeForce R310 driver has been designed to ‘showcase the enormous potential of the world’s biggest open-source operating system’.
NVIDIA collaborated with Valve and other games developers in designing the driver, having been ‘thoroughly tested’ with the Steam for Linux beta.
…NVIDIA has [increased] gaming performance under Linux
“With this release, NVIDIA has managed to increase the overall gaming performance under Linux,” Valve’s head of marketing is quoted as saying.
“NVIDIA took an unquestioned leadership position developing R310 drivers with us and other studios to provide an absolutely unequalled solution for Linux gamers.”
http://www.omgubuntu.co.uk/2012/11/new-nvidia-driver-doubles-performance-on-linux