Ye Rong had just used up all of his weekly free appraisal times at Senior Brother Chen Tai Zhen a few days ago.
Even though he is the leader of Tian Shu Hall, the number of free appraisals is not unlimited; he would have to spend Sect Contribution Value for additional appraisals once they're used up.
The required Sect Contribution value for each extra appraisal varies, depending on the value of the item being appraised. It was not a fixed amount.
Doing the math, it was obviously not worth it to use appraisals now, so it was better to wait a few days.
"Vimoha Ruler, nice name."
Holding the moist jade ruler in his hand, he rolled it back and forth. A bit of milky-white light flew out and circled between his fingers.