Rakeback?

OK so I am kind of confused on rakeback and cardschat. I have accounts with FT and PS, but have heard good things about Merge Network and am going to create an account on Carbon Poker. I want to sign up for rakeback (as I didn't do that for the big 2) but am wondering if that is possible to do through CC or does CC just have a deposit bonus code? I found 30% rakeback on rakebrain.com, but am just double-checking before I do, because I would much rather the affiliate rake go to you guys.