It's worth $0 because Digg doesn't allow people to use their trademark in domains. So if the site ever became successful, you'd get a nice letter from Digg's lawyers telling you to take the site down.
i`ll talk to digg.com but i do not think it is a problem ... because to digg in english has sense ... so i do not think that they took over the dictionary ...
There is no word in the English dictionary named "digg", therefore it can be copyright and protected by a company
anyway ... this is for sale ... i had a search engine on it .. .so if the people who buys it will want me to setup the site ... i will ... i am expecting offers. ... thanks!