Just make sure that you play +/- $0 on average and you can be a winner on iPoker. There are some pretty good sites out there that offer "cashback" over the point system of the iPoker network and also some better options via affiliates.
Playing NL100 with 50% cashback/rakeback as regular nit on iPoker can already make you a living. Add a few BB/100 and you do not even live that bad!
And I heard NL100 is tougher then NL400 on iPoker, that is why a lot of people get stucked at NL100.