I understand what you are saying, but Macs are becoming very popular now that there are cheap ones. Also, simulations typicly do very well on macs, look at X-Plane.
Isn't LFS already running on openGL? That would make porting it much easier.
I'm not trying to say that you are wrong, just that there may be a bigger market out there than you think, and that it may not be that ridiculous of a thought.