A few reasons really, the main one is that my wheel broke about 5 days after release and I only got it fixed a couple of days ago, I'm also at Uni and play a few other games as well, so even in those 7 days I didn't have a whole lot of time to play. When I have been on, I've been working my way through single player to earn credits and cars, I've been practicing for a GTP series, but most of my time has been spent trying to get in the top 10 on the leaderboards and then doing the occasional sport mode race, which were hard to get into initially due to the servers disconnecting.
It's also worth noting that I've barely gained any rank the past 5 races, first one I noticed it was the last race before my wheel broke, so looks like I would had to have done a lot of races to get my rank up to A or S.
I can understand that to an extent, but I don't understand why there is such a huge emphasis on it, being 7 seconds faster over the course of a race and being fastest in Europe gains you 30 points, whereas being an A rank instead of B gains you nearly 1000 points. A championship run by the FIA shouldn't be rewarding people 100s of times more for having spent more time on the game than being fast.
I am B/S, I was comparing my total race time to other guys in TRL, mine was a 17:23 and they did 17:19 and 17:16. For that we got 492, 1447 and 525 points respectively. (7:16 was TRL_Lightning)