most often you're right, but what was the advise you told the other members, you knew the game, get over it, not worth to do anything, even the thread is not worth it!
I've made a deal a few times with OCT @JohnLocke when trading with a user from here. The amounts weren't that large, around $5,000–$10,000, and it worked perfectly.
As long as you have other people managing your business, there will always be a theoretical risk that they could collude to cheat you. It all comes down to risk assessment and weighing that against the potential gains.