Ask a real-estate appraiser what a house is worth and they don't guess. They pull what similar houses nearby recently sold for and adjust from there. Domain appraisal works the same way, and the equivalent of "recent nearby sales" is the public record of past domain sales: the comps. Learn to read them and you can defend almost any price you put on a name. Read them carelessly and you'll talk yourself into a number the market never agreed to.
This is a companion discussion topic for the original entry at https://namefi.io/r/en/blog/how-to-read-comparable-domain-sales