.EU has done very well in the past in regards to domain sales.
I would place my valuation of XXX low X,XXX max if you find an appropriate end user. Green domains typically have a plethora of people following suit -- and with it's brandability it could be utilized in a number of manners.
However, everything is subjective -- I would simply wait on it as the market grows, or list it up and wait for an end user to discover it.