Just because you changed your MSN in signature right after the trade doesn't mean you can get away from this. I'm sure they have a detection for this. It's so sad being banned for 7 bucks.
Got an overall $0.41 per million after he scammed. Compared if I sell it to extremely legit player for $0.50 per mil, I basically just lose about 3 bucks worth of gold. Definitely worth it to get this scammer banned.