Rake Back - Why not?

Playing without rakeback..makes no sense.
Nothing to risk, or anything to afraid.
You just get at least 30% of your rake back.
Why not?
So simply is the question . :)
You play and at the end of the month , you get your money back.
Why leave em at the casino? Looks so easy and it is.
I started getting rakeback via rakebrain and i'm very satisfied.
Check it out