Craigslist also became a cesspool of wasted time.

"No, I'm not going to accept 1% of what I listed. I'm going to put it in the garbage instead since my time is now worth more. In fact, I've now had enough of you assholes call and lowball me that I'm now net negative even at what I listed so into the trash it goes."

Presumably, Facebook Marketplace simply hasn't gone through the degradation cycle, yet.