Not really - but you'd think it would have, especially as it's cross-platform.
Maybe it's more that not many people have tried the prototype gt cars yet, or that they want to race, rather than hotlap.
edit : the game is really quite fun to drive, but a lot of cars are really drifty - makes me wonder how the developers haven't included a drifting mode.
Basic tuning is available, however, downforce is not tunable.