Well it's not the case for me in the 900-1000's I just don't have the time for it. I invest most of my hours in to Dota 2 and it's bad enough dealing with dickheads in that game but at least in Dota 2 I can swing things in my favour by queuing with GAF. I don't want to have to invest hours into iRacing just get out of the trench just so I can enjoy myself. Not when I'm paying them to do so!
There are plenty of games which don't have huge fan bases which can still afford free matchmaking and cheap content. I feel the reason sim racing is niche is because of the ridiculous pricing and
poor pad support. I don't blame anyone for wanting to pick up RaceRoom (picking this since it was on the front page of steam) only to find you have to tinker with the pad to get it working correctly and once you've done that find out that all the content in the game at the moment costs roughly ~£40. That doesn't include SP or MP either. I'd just laugh and delete it and go back to Shift or F1 2013.