This was not stinginess but great favor and honor.
Capturing an assassin from the Inner Mansion Realm is a deed whose importance could be either magnified or minimized. Jiang Wang actually failed to stop Cui Zhu, and Cui Zhu, in fact, never had the chance to get close to Emperor Qi.
However, Jiang Wang's immediate interception of Cui Zhu and his decisive actions to isolate the noise and minimize the impact of the assassination attempt undeniably earned him a lot of credit.
Emperor Qi decided to record this meritorious deed and to express his expectations toward Jiang Wuhua.