I did not see the negative feedback. The + and - were at 0 before I posted. I admit I should have checked past threads.
That is what I understood from your situation. However, I'm saying that you can't expect some sort of trust system to prevent everyone from scams and potential scam attempts. There are some people in DT that have worked hard on fighting scammers.
The admins should also delete scammer accounts.
What would that accomplish? They could just create another account and try again.
What does trading have to do with trustworthiness? If I keep my word that makes me trustworthy. I don't need to do a trade just to boost my credibility.
I guess there are cases in which one proves to be trustworthy (e.g. they don't run away with upfront payments or when they hold a lot of items). However, I do agree with you. Doing trades should not make one trustworthy by default.