It's not practical for the forum administrators and moderators to pursue scams. There are too many gray areas, evidence is often difficult to verify, and the process is time-consuming. There's also the fear that staff might suffer a conflict of interest if they are expected to moderate scams. The best solution is the leave it to the community.
Practicality is not the issue here on why scams are not moderated here in the forum. Basically it's part of forum's way of practicing free speech just like how our trust system is unmoderated as well and they leave the DT members to decide on matters such as this where a member tries to scam another member. Basically what this do is make the admins and mods as neutral as possible here in the forum and let most cases like this be settled by themselves or with the intervention of DT Members.
I am a newbie in bitcointalk but I own a forum myself(for betting) and I am not new to internet payments. I saw in the escrow thread that the user who does the escrow asks for payments only to 1 bitcoin address and if it's another - then its an impostor. I think this user was trying actually to fish me for more than 200$, he may have even went for this trade green and then scam me for bigger transfer.
As for the first 2 trades of this user, from what I understand he sent first because they were trusted users.
Thank you for the advices!