I fell victim to this once with uin. The problem I have is that these guys are intentionally trying to LURE people into hitting them using various tactics. Granted, if you fall for this TWICE you are stupid but....it can be rough on new players who will just assume that the trade area is safe.
I don't think it is fair to blame it on the new folks, they don't know, compared to the seasoned players who know EXACTLY what they are doing and are trying to get some easy loots off people who don't know any better.
The time I fell for it, I was town looking for repairs, I spammed in trade chat and shortly after uin came over and started targeting me attempting to get a reaction (swinging sword, spamming skills). As a result, I ended up losing a very large number of broken god picks and a stack of diamonds. I know it's easy to say "Well you shouldn't have attacked him", but I didn't know any better, and I was being trolled. My guess is quite a few players would ragequit right there and you'd never see another $$ out of them. Considering the high turnover here as it is, that's probably not a good thing?
Just an old fart's 2c.