Any domain has potential. Example: imveryvaluable.com could fetch $5k (buyer could be someone that has the money spare, sentimental, even an inflated ego)...but it isn't likely, at all. I look at what is likely, fair, judging the market, what similar domains have sold for etc...not high speculation, picking numbers out of the sky, and aiming for a miracle...otherwise I may as well say your domain is valued between $49 - $250k...not exactly useful in an appraisal