What if the original owner wanted to redeem his land?
Lévitique 27:19 (NEG79)
19Si celui qui a sanctifié son champ veut le racheter, il ajoutera un cinquième au prix de ton estimation, et le champ lui restera.
If the worshipper wanted to redeem his dedicated land, then he was required to give 20% above the priest's valuation of the field. The point is that the price of redemption was equal to the investment.
19 Si celui qui a sanctifié son champ veut le racheter, il ajoutera un cinquième au prix de ton estimation, et le champ lui restera.