rakebck pointless for low mgr?

I am new to rakeback/affiliates. I play 25NL, a little bit of 50NL, and cater to the promotions and bonuses - is setting up a rakeback a waste of time at these limits?

Some numbers - $96.31 in rake over 4661 hands since 10/13/05. In the same time I cleared $120 worth of bonus. I guess this makes my MGR negative, right? Is my best bet just to keep bonus whoring until I play much higher stakes? At what point should I start worrying about rakeback?

The other thing is that right now I jump around to whore the best bonuses and don't neessarily play one site only. So setting up affiliates for one site is pointless, right?

/me puts flame suit on