That's why I and others leave negative trust and I recommend guests to register to see the seller's trust before making any deal and to avoid auto-buy links.
I can't find any advantages on maintaining this list instead of using the trust system:
- It's more likely people check someone's rating than this list before making any list
- This list would be maintained only by me instead of several people (your suggestion of having several users to maintain it is better, but I still don't think it's better than the trust system)
- People could think the list is exhaustive and trust a scammer just because it's not on the list yet
- A lot of work would be required to maintain the list
- ...
Let me know if I misunderstood what you mean.