Upload & Sell: On
It's not a deal-breaker for me, but I think it is considerate when a seller posts the history of an item. I do think it matters a little. A lens with a single good-rep owner should have a bit more value than the same lens with an unknown history.
Same with refurbed gear. I buy it with no concerns, but I think someone selling it should represent it as such, if only because some people will value it differently.
Transparency is a good thing in our dealings.