Because they have no ethical morals, standards, nor creativity. A majority of them are probably talentless hacks that couldn't get anywhere a barely get anywhere. They're parasitic leeches with nothing better to do in life.
I highly doubt this is much of a hot take nowadays, but I never even cared much for the Hunger Games novels either. They're only barely better than the movies. The "competing in a violent death game" can't get much higher than Battle Royale, if we're talking about kids or teens killing each other. If we're not talking about that, then MadWorld, the Running Man (both versions), and SMASH TV top pretty much nearly everything aside from BR. With all that said, I can never watch the movie adaption of BR again. It's not a bad adaption, but it is hard to watch nowadays. I sold the DVD years ago though. I won't be reading the original novel nor manga version either again as well.