Jiang Wuwo naturally wanted to profit more now that it was impossible to cancle the marriage.
The Quasi Relics were one kind of gain, Mystical Materials were another but compared to Jiang Qiling, they were not nearly enough.
Jiang Qiling was the future chosen warrior for the human kind. When she soared up, she would bring benefits to the Jiang Family's development. But that was what the Jiang Family deserved. Lu Family must pay enough for Lu Li to marriage a future chosen warrior into their family.
It would not bear much meaning for Jiang Wuwo to obtain a larger quantity of Mystical Materials because they would run out some day. To gain long-term advantage, Jiang Qiling's status in the Lu Family must be guaranteed.