Worth as much as gold is a stretch but they do use and depend on it for fertiliser. They call it 'nightsoil' and someone from each community has the lucky job of collecting it every night.In North-Korea Human Shit is worth about as much as Gold.
Lack of Fertiliser created a total new 'smelly' market.
Such was the case in the 90s anyway, I doubt much has changed.
Learned about it in a book called Nothing to Envy which I'd recommend to anyone with even the slightest passing interest in North Korean society.