Revenue share takes time. As others have said PPL gets you the quickest money especially if you are reinvesting the money into media buying or what-not.
Also as others have said you would not be getting paid $12 per lead if the traffic wasn't backing out for them. Likely either your leads are of very high quality and over time are generating much more income for the company, or they are scrubbing whatever % of leads to create a profit for. They obviously are not in the business of losing money so one way or another they are profiting more than they are paying you.
Back when I was heavily invested with my own targeted traffic I chose revenue share always. Of course many companies took my customers overtime but I still made a killing.
Now that we buy the majority of our traffic PPL is the ideal as it gets us a return quicker to reinvest.
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