I don't see how it could be worth $50,000 if it just sold for $2,001 on one of the largest public domain name marketplaces. I belive a domain name is worth what someone is willing to pay for the name. Nobody else was willing to pay more than $2,001, so that is the value. Sometimes you get lucky when you are able to confidentially negotiate with a private seller in a private manner, however, when you are bidding on a name in an open forum, and the price is posted on that site's homepage prior to closing, others had the opporunity to bid more but they did not feel it was worth more than $2,001.