I see a lot of positive trust being left recently by escrows when a deal is complete.
This is unnecessary and weakens the trust system.
As an escrow, you do not need to trust the person you are escrowing for. You are not risking anything as they are sending to you.
I know maybe you want the positive trust in return, but don't allow yourself to be bribed - positive trust will come to honest people eventually.
This is the rule that I follow and I find it that many users do not leave trust back either (although they should if they are following the system, since they are risking something).
I will never leave positive feedback unless there was something extraordinarily different in an escrow deal.