From sold-out + -ness.
sold-out-ness (uncountable)
- (rare) The state or condition of being sold-out.
2007, Michael P. Knowles, The Folly of Preaching: Models and Methods[1]:Over the violence and the proud loyalties, over the sold-out-ness and the cruel indifference, there is light reclothing us in a kind of strange innocence.