I never understood the whole double letter, premium character fad with domains. I guess it's a reseller thing because on an end user level a domain like this really doesn't have a lot of value.
dggu isn't a word ... it's not even something you could make up like Goobu isn't REALLY a word but it could be branded into some sort of thing. It might be an abbreviation for some organization and THEN it would of course be of valeu to them but overall on an end user market, I would say this domain isn't worth anything.
However that being said, our reseller experts may see things very differently and give you a value based on their knowledge and experience.