So far, I don't have much enough of anything to be worth selling -- wine and rats and secrets seemed useful, and the rest is, like... *checks inventory* lamplighter beeswax, jade fragments, moon-pearls, and nevercold brass slivers? I'm kind of assuming "hang on to everything until you find a reasonable place for re-acquiring it".

(I did sell my prison stuff and get a dress. And a goldfish.)