Though I've gotten in trouble for it several times through the years, it has been a valuable source of materials others don't value till that material becomes unavailable to them.
Besides metals and wood I value plastics and glass and Bakelite.
Having grown up lower income I was brought up to appreciate what others cast off and its paid off over and over.
Some jobs I've had in the past had a junkyard I salvaged from, for making their equipment run again.
Any one?