Whats the difference between 后宫 and 炒股

As I understand 后宫 is your typical harem style narrative.

And 炒股 is speculation, where the fun is in figuring out who the MC ends up with? And there are not as many characters competing fto be MC's love interests right?

Asking this in the context of Chinese Paladin (仙劍奇俠傳) series of games, and its narratives.