In my old neighborhood in Chicago we had a "freebox" group. The motto was "never buy what you can borrow, never sell what you can share. " There were mods and the #1 hard and fast rule was no selling. If you can't use something anymore, donate it or put it back on the box. I get that things happen. maybe something you got on freebox a year ago could end up in a garage sale pile. But to turn around and sell something there was not ok, because the idea was to share with parents who can use stuff to stop them from having to buy it. It created a really great community and there were real-life freebox "sales" of clothes -- bring a bag, take a bag type stuff. All that being said, it required mods working overtime to ensure fairness and proper decorum. I don't have the time to start something like that but I love the idea and wanted to share it here in case it inspires anyone!