gotcha!
so i only include users in my 'trust list' who have been noticed positively/negatively in the past with another forum user or were already members as dt1/2 - correct?
You include users with whose judgement you trust. Users that have left positive and negative trust on other users that is accurate and who are not scammers.
When you trade with someone and it goes pos or neg you open the trust page and can click post new feedback. Then leave them a + or - review for your trade.
If you trust someones judgement and they seem to leave accurate feedback you click trust settings and add them to your list. If they leave bad ratings on people you click trust settings and ~xxxxx name and exclude them from your list.