Just to touch up on what Sam said, I wanna give an example, the Ofna/Picco JLR "Red-Dot" engine was unknown until I believe Jeffery Lin won the Kyosho Race and Placed very high if not won the winter nats.
Now that engine is selling like hot cakes, I bought one, and many other people bought one now that they know its good.
The G4S is the same way, its a great car, but no one knows or cares because there is no headline news saying it won a big race in the states.
now on a second note, what really gets to me is the fact that the M1 hasn't won any major races in the states, its fairly brand new, and has probably 70% more parts support then the G4S.
That is why I started this on RCCA and brought it over here, there is no excuse for one car to be so much more popular then the other when neither has won anything HUGE in the states.