I can pretty much guarantee you could steal the authentic Mona Lisa, take it to Pawn Stars, and they'd give you 20¢ because "ThEy'Re TaKiNg A rIsK bUyInG tHaT" just to rip off customers who don't know any better.
If Discovery's reality "people in the jungle" is anything like the Primitive Technology channel on YouTube, that might be good. I was really impressed by that, and it was popular on Reddit. Some guy -- IIRC a Kiwi -- heads out to the forest with nothing other than his shorts and starts building up technology from scratch, using only what's in the forest -- last I watched, he'd gotten up to iron production.
The goal of the networks is to sell ads. If this gets more views then it gets shown. Nothing more to it than that. You're looking for quality entertainment. They want to sell over priced car warranties. Those are very different goals and so the paths have diverged.
History channel: “We don’t understand basic concepts of engineering or physics, so here’s some shit about how aliens must have built the pyramids. We also have no idea how skyscrapers or bridges are constructed, so that must have been aliens too.”