I agree- a reward in the form of increased rev share or an additional CPA on top of the existing rev share always incentivises me. I don´t mind if there are player targets- better if it´s stepped.
What always winds me up and makes me avoid a program like the plague, are the “raffle-prize” targets- ie send us a bazillion players next month, and you´ll get a free entry into a prize draw to win a second hand food processor. Independently audited of course.