@Finnian, I'm not opposed to the idea. I think I've been clear about that, but you can't paint too rosy a picture of even a good thing.
Uhm, who's going to do business with such a person? If the gig is posted by a known scammer, who would be dumb enough to hire them?
Let's think about this. First-time scammers aren't "known" scammers. People new to Narrative may not know the scammers who are known. And, don't forget, there are many ways to conduct a scam. People can steal items locally and sell them online. They can forge documents, hack into unsecure wallets, or do things you and I can't imagine. Some people are as smart as others are stupid.
I get the buyer-beware aspect of the free market, and I favor it. You're talking about someone who has thought about, read up on, and written about libertarian philosophy and ethics. I get it. But you don't wish the negatives away. People are as stupid as they are depraved. That's why a marketplace where buyers can put money into escrow while a seller works on delivery is a positive way to alleviate such concerns. Meanwhile, I think your niche idea is a good patch until such a marketplace can be created.