I like swap blankets that other places do when you are there in person, you can inspect the goods immediately. I'm not a proponent of selling used items on this forum. I'm not really keen on trading items either. I think its a good way to start bad blood.
Some of the people here know an enormous amount about steel, for example. If they are sold/traded something that is made of crappy carbon steel, simply because the giver honestly didn't know better... well... if you start waving that caveat emptor flag some people would just feel burned and leave.
I don't want to see that happen.
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You can't teach experience.