Well I think it will be hard to turn out a good profit if you have not your own paysite to advertise.
Example: Take 3% as ctr = only 3000 clicks now to make your $700 back on $35 pps you need to convert better than 1:150 (not that easy)
So it really depends how much ctr your banner can create! If you can get 10% then you only need to convert 1:500 or better to make the money back.
So without rebills / your own paysite you need a sponsor that converts somewhere between 1:100 - 1:250 on average to make a slight profit.
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