Normally I would say any prefix brings value of the domain down, but in this case, prefix "us" makes the opposite.
Can serve many different end users very well. They can have totally different budgets. I guess how this name will sale will not depend really the name itself, but on how it will be marketed and to who, and when. Seems like now is the good window of opportunity to sell it.
I would say mid XXXX+, as there can be tens of thousands of people on this planet which might be interesting in the name, with desire to put various content on such domain. Marketing will be everything in order to sell the name.