I believe they are under the impression that webmasters should be pleased that they get content, and that’s it. They believe you are happy anyway, since you get traffic for the content they provide you with, and you monetize it by sending it to your offers.
Besides, they know their content is watermarked, so if a visitor likes the video, he knows how and where to find more like that. SO they stopped the payments, because you still need them to give you content for your website.