Although Cui Yu was a standout in his generation of the Cui family, his seniority was low, and there were peers with even better talents. Since joining Qingming, Cui Yu had used essentially all the family contributions and his monthly salary to exchange for the intelligence that Wei Yuan required.
Wei Yuan was aware of this; however, he had no good way to compensate him for the time being.
Based on Cui Yu's current status within his family, he still couldn't obtain the core secrets of the royal families of various nations. Nevertheless, Wei Yuan didn't need to know too much; just understanding the openly known intelligence was sufficient for now.
Wei Yuan initially had no interest in the succession struggle of Western Jin, but the Primordial Consort had hinted so clearly at the end that he had to help her, or who knew what she might do. What if the word got to Prince Jin's ears? Wouldn't Western Jin then send the might of the entire nation to flatten Qingming?