Well, there is absolutely no surprise at all that you got scammed by him. He's probably one of the most active scammers on the forum that is still operating today.
You should have really been alarmed by the high discounts that he's offering, that no legit seller would ever offer you. That was the first warning sign. Him not going with escrow and asking you to go first was another warning bell that should have went off. Lastly, the stickies in the digital goods section clearly say that self moderated threads and autobuy links should not be trusted. These people lock and self moderate their threads to prevent people from commenting negative things on them.
That's not to mention that you should have looked at his trust ratings and instantly turned away from all his threads - he's already been tagged, both from DT and non-DT members. You do have an account here so you can definitely see those. Most people that this guy scams aren't logged in because they can't see trust ratings, but you can.
Take this as an expensive lesson. Nothing else you can do about it now.