Metal detector people keep doing this (rarely)

 

I suppose that the fascination of using metal detectors is more than finding bottle caps, loose change, and the occasional spent bullet cartridge (depends on where you do it, of course).  It must be that there's a chance, however tiny, that one might possible defined a treasure or historical artifact of some kind.

So what keeps a lot of people doing it is the fact that a very few people have done that -- found the rare historical artifact with both historical and monetary significance.

So here's one of the more recent examples.

Metal Detector Hobbyist Finds a 500-Year-Old Pendant Linked to Henry VIII

"The pendant itself was an ornate spectacle: The front was decorated with a pomegranate bush, an emblem of Katherine, and an entwined, double-headed Tudor rose, which was employed by the Tudors starting in 1486. On the other side, the letters H and K — for Henry and Katherine — were written in Lombardic script and connected by a ribbon."

Here's the pendant itself.