As a kid, my "job" was buying electronics from wealthy kids secondhand and reselling them. When I got older, I did the same by flipping motorcycles. Since I joined the working force I don't flip anymore, but do continue to buy second hands where possible. However, about four years ago, things started to change. The good deals began to dry up, and people started "overpaying". For example, I bought a new sleeping bag for €200 during an end-of-season sale (50% off) and later sold it secondhand for €320 after using it daily for six weeks on vacation The person could have bought the item, with 2 years of warranty for only 80 euro more, with an high change of the item being in sale again soon.
I think two factors contribute to this. First, secondhand in general has become much more popular. I remember my parents and friends used to found it odd that I bought items secondhand. They were curious about how it worked and whether I ever got robbed or scammed. Nowadays, there are advertisements for "vintage clothing" right on my street, and these items are worth more than new fast-fashion pieces.
Second, environmental awareness has increased. Even my parents have changed. They recently bought a secondhand table for environmental reasons. This shift has for sure affected the value. Which is a good thing!

Jacob once mentioned that secondhand items are getting closer to their true price. Is that what's happening? Were secondhand items always undervalued? How do you guys experience this?