There was an incentive offer that I sent lots of traffic to and only a few of the leads were counted even though loads of them registered to the site and even sent me proof.
Then I tested another offer in the same niche and right as I was thinking about switching networks, I started getting a lot more leads at $2.20 epc.
Test all of the offers in your niche until you find something that works. Usually I would go for the high EPC offers, thinking that those were the best, but now I'm running one of their lowest EPC offers in my niche getting crazy conversions.
The funny thing is that all of the offers I've tested had an almost identical landing page, but one shaved me, and the other didn't.