you get 50% FPP bonus at Silver star
100% FPP bonus at Gold star
150% FPP bonus at Platinum star
250% FPP bonus at Supernova
400% FPP bonus at Supernova elite
about the rakeback comparison, this thread might help you:
http://forumserver.twoplustwo.com/showfl...rt=all&vc=1
Ryu
SRB