At Pasture Pals Equine Rescue our adoption fees have little to do with "appraised value" of the animals, but everything to do with finding the right forever home and helping to fund the feed and vet bills of the rescue.
PPER does not post adoption fees, because there is no "set" fee. All of the animals are different with different abilities, different personalities, different histories, and different needs. Instead our adoption fees are based on 50% of our monetary investment in the animal, then adjusted for age, health, training, or special needs. With the minimum adoption fee always being what the Feed Lot would get if selling the animal for meat, thus discouraging unscrupulous people from trying to get the animals cheap and resell them to make a quick profit.