I think part of the allure with "free" is that many times they're used for things that we wouldn't consider using them for. The expired canned food thing, if I had a gun, I wouldn't personally eat the canned food, but I'd totally line those up as targets for a satisfying explosion if I got a good shot in.
So listing something like incandescent bulbs for free might not yield someone who wants to put them in their home, but perhaps someone who has an artistic or destructive idea in mind that makes sense if it's free, but not if they have to purchase?
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