Several F2P games that I have played recently have temp costumes in their shops for 150 CC to 600 CC and 40 bucks will get you 5000+ CC.

It doesn't take a rocket scientist to figure this out. A few players buying here and there... or most of the server spending 40 bucks a month cause this can buy you a costume, 30 days premium, some pots and a few dungeon entry items...hmm?