I think the majority of people who havent been tempted to buy into this game have forgotton about the fact that this game is based upon community feedback.
Unlike other racing games with developers saying they listen to the community but dont well C.A.R.S (community assisted racing simulator) whole system is based on the community so if the community goes or does not contribute then we will have a bad game.
You work together as a public team then post on forums your ideas/feedback, then the team at mad studios base the game around this, also they have the ex "stig" on board who has written a post explaining of changes needed.
So imagine a battlefield 3 being built purely on community feedback.. imagine how awesome it could have been... well this is the case for a racing sim! This game has potential to be an epic of a racing game, If people put the effort in.
Also you get your money back at the end of development which let me remind you is still in alpha, so even in a earlier of a build stage than the current Rfactor 2.
thats my two cents.