>>791667The YT channels i've seen where guys do this, they're mainly finding old tools or military relics.
things like axe heads, old rifles, and stuff
Its a novelty for the historical interest and nostalgia of old things lost by who knows who.
For many of them its definitely not about finding 'valuable treasure' of any kind. its the fun of the hunt, the thrill of finding stuff. And the mystery of imagining how the item came to be there.
Its just not a hobby that everyone is going to be attracted to.