The answer to that is because its FUN!
I have a game demo station here in my lab and its nice to have different controllers to pick from, especially for multi-player.
The technical challenge of getting it working properly has been enjoyable, and will be until I get everything 'just right'.
Another answer is that currently, I have no RC vehicles of any kind, and don't need this program as a 'trainer'. Its purely for entertainment, and to marvel at the techincal accuracy of the flight modeling. I have always loved flight sims, particularly for helicopters, and this one is the cream of the crop so far, despite not having all the bells and combat whistles of Jane's Longbow 2.
~MarK Indiveri
Test Engineer
NVIDIA Corp.
www.nvidia.com