The time of flea markets has restarted here in Switzerland spring. Hundreds of people empty their cellars or apartments and try to sell stuff they bought years ago and of which they feel they don't need it anymore (or, have probably never needed it anyway).
Or they simply need cash to buy stuff which will be taken to a flea market again years later ;-)
I wanted to sell things on a flea market once too, some years ago. I looked around my apartment and did not find anything I could sell, although I needed the money. Why ? Because later in life I never really bothered buying stuff except things I needed for daily life, means food, a bed, a closet for my clothes, and, well, that was it. Too bad...
In 1995, when I first went to Mali, I filled a container with personal stuff such as records, tapes, photos, books, a used car, computers, just - everything I owned. I had a record collection of about 400 LP's, among them original Parlophone Beatles' LP's from 1963-1966, the first complete year 1954 of Mickey Mouse comics in German and more. All in very good shape...protected in plastic covers.
Unfortunately the house burnt down in 1998, we had to relocate to a rented apartment, and my life history was up in flames - gone.
So I came back to Switzerland pretty empty handed, What did I do ? I went to flea markets to buy me some used furniture, cheap clothes in a store in which they sell stuff which has become unfashionable (1 year....) and restarted life. But I missed my records and books which were a part of my growing up. And I couldn't find them on flea markets, of course. So I started to download all that stuff again, bought new books....but of course an mp3 doesn't give you the same feeling as an original Mono LP ;-)
The bottom point is: When I'd have been careful and foreseeing, I'd have stocked that stuff back in Switzerland, because NOW I could make thousands off all that rare stuff I owned as a youth when it wasn't worth anything more than the sales price.
So - take good care of your old stuff. It might make you rich one day or help you out when you need it.
Not only on a flea market.