He has most likely scammed in the past, however, the biggest offense this user is committing is selling gift cards that are obtained through fraudulent means. In this case it seems he is most likely using stolen credit cards to purchase them.
He's scammed several people but the only fraud he's committing is selling non-existent crap on these autobuy links. Digital Goods is rife with them. People shouldn't get greedy and think they're getting a good deal because they just get bitten.