Live CD for PC Games?

Onion asks: "Can anyone inform me why games developers don't put out games on a 'Knoppix' style live CD? This would negate coding the games for different PC platforms. Provided the hardware detection routines were up to scratch, the game could be coded using GNU/Linux for development and would run on any PC machine, regardless of OS. Only major drawback I can see would be the need to 'reboot' each time to play. Any thoughts or views on 'why not' ?"