Denmark did sell the Virgin islands to the US in 1917, so it's not unheard of. I think that back in the day, Denmark was keen to have a US base on Danish soil,

Denmark did sell the Virgin islands to the US in 1917, so it's not unheard of. I think that back in the day, Denmark was keen to have a US base on Danish soil, hehe :) (Also selling land and citizens probably became tabu, as is today) I would suspect that later it became the reminder of former glory... But in future, we'll likely have to give it up, if it ever becomes profitable on it's own. (Unless, Greenland somehow becomes profitable by using it's ties to Denmark, for trade, etc..)