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There is no rakeback available for poker star
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Don't know about poker star, but there is an equivalent of rakeback on PokerStars. If OP is making 400,000 FPP a month he must be Supernova. Just go to cashier, then VIP store and buy $1,500 award bonus for 100,000 FPP. You need to get 10,500 VPPs and you get cash into your account.
In summary you get 1.5 cent/FPP rate.
http://www.pokerstars.com/fpp/store/...l/vip-bonus-1/