C. F. Keil and Franz Delitzsch on Leviticus 27:11-12

Lev 27:11-12

Every unclean beast, however, - an ass for example, - which could not be offered in sacrifice, was to be placed before the priest for him to value it “between good and bad,” i.e., neither very high as if it were good, nor very low as if it were bad, but at a medium price; and it was to be according to this valuation, i.e., to be worth the value placed upon it (הכּהן כּערכּך according to thy, the priest’s, valuation), namely, when sold for the good of the sanctuary and its servants.