Be Careful in the Very Subjective Domain World
Unfortunately there is no formula for calculation of the value of a domain, and the value of a domain changes person to person.
Without an expert's insight, you will be fighting in a subjecitive world that you can be easily manipulated
Know the REAL VALUE of the Domain
Without knowing the real value of a domain (whether you are buying or selling), you will end up losing money.
Each domian has its uniqueness. Therefore, each domain needs to be evaluated within a domain appraisal framework