Pricing domain names is challenging. The domain name market is dynamic. Domain name values can fluctuate based on many factors related to the domain name and the seller. If the price is too high, buyers may ignore the domain name. If it is too low, money can be left on the table.
One aspect of Atom.com that I find helpful is that it will help price domain names. Upon premium acceptance, Atom.com provides a suggested price with bracketed prices that are higher and lower by a percentage based on the membership tier of the seller.