Hmm. ukcoolcat, even PS.com did not give rakeback or other bonuses to its members you would be still making profit, providing that the RAKE you pay is the same whether you are a PS.com member or not.
I think you're missing the point that, once poker room takes rake this money is not yours any more, but obviously you still think it's yours. Poker room is free to make any deal with its partners and even they can give the %99 of rake paid by the player to its partners. There is nothing you can do about it. Why don't you want to accept the things PS.com has to offer you but refuse them. By refusing them aren't you cutting your own profits ?
It's a win-win situation. Everybody gains something from this chamber except the fish you play against. Why do you care, if you bought some product and the producer who gave the profit you made to him to someone else ? PS.com is basically offering pay for one get not 1 but more.
Note: I'm sorry for my grammatical mistakes and I don't mean to offense anybody.