After trying lot of Clickbank products finally i have earned $190 by promoting only one product which offers readymade adsense websites and gives 75% commission to affiliate. I have generated 10 sales last month and nobody requested refund. It's adsensepowered.net and i think people like to purchase readymade products with the name of Google Adsense. That's the my experience.
It's always great when hard work pays off. You found something that works, now all that's left to do is just send more traffic. If you used PPC, then you need to maybe increase your bids a bit to get more clicks. If you generated traffic through article writing, you need to send more articles. The idea is, do more of what has worked, and logically, more money will be made.
I don't get why the website is putting adsense on the page. If its earning from sales, why are they directing visitors away from their product?