I guess it's also a mojor important fact that all the young GTR/GTL players, which should be way more than 90%, are playing in Arcade mode with game pad, and have never heared anything about RSC.
In LFS, we have ALL ages, from 10 to 70 or something.
Also, people are way more relaxed and still understand that they are playing a GAME. Of course, LFS is a very realistic program, but still a game. You can make use of certain advantages which are not there in real life. Shift-S while racing (beaming car off the track), resetting car, no random damage.
All are things that improve the gameplay significantly, but don't really make LFS an arcade game - the loss is rather small compared to the gain, which is huge, because LFS is WAY WAY WAY more fun to play than ALL the other sims out there.
Maybe that's also the reason why many ppl over at RSC are just pissed too much - the sims they play are no games, and thus no fun