Well I guess people have more or less made their minds up on this. I will say though, I mostly drive on rallyx circuits (not much online yet) and half the time that's XFG on blackwood (demo racers could drive the same!) or LX6 on same. Getting some S1 racers to be able to join in races on S2 servers (especially if there are S2 cars included driven by other players) may be something to encourage them to upgrade instead of ignore that LFS folder and play more rFactor...
Track change to S2 only, S1 drivers can't leave pit or something, they go somewhere else. Maybe they go to the website to buy an upgrade because of the great races they had for the last hour with their S2 friends.
You catch more flies with honey than vinegar