I agree. I'd like to leave feedback to people after the fact or who didn't make an official "offer".
Thirded? Is that a word? If so - thirded.
If not, well, I think the meaning is conveyed.
Some sort of distinction should be made visible at the top level between NIB and non-NIB items. Kind of a pain to browse through a bunch of used "ARF" items when looking for a new one.
Searches seem to exclude items which have been sold already! This needs to be changed. How else can one gauge whether the asking price is within bounds?