Maybe it's time to start selling? Include rfactor-2 when buying obsolete rfactor-1. Or promote a 50% discount for upcoming rfactor2. E.t.c., but don't just sit there.
There is an offer being run now on Steam that if you pre-order Modern Warfare 3 you get a free copy of Call of Duty 4:Modern Warfare. They have run similar deals in the past, perhaps thats something to consider? There doesn't seem to be a lot of promotion going on for rF2 at the moment, maybe its further away from release than we'd like to believe?
Well, if it comes to that, my personal bet would be December 2011 ^) which also leaves room for January 2012, and taking into consideration the holidays we are looking at February. So I'll stick to Feb.