I would be surprised if that were the case. IIRC it worked by using a skill that let a player put up a buy order without taking the entire cost of the order out of their wallet. So the player could then ditch all their remaining money, which wouldn't allow the buy order to be fulfilled.

What changed that disallows it? Did they remove the skill? Can a wallet go negative? Even if they forced the buyer to take the item and give the amount of money reserved to the seller, the scammer could theoretically just make sure that the buy order is close enough to the sell order that the seller still receives less than they paid. (though it makes it seem like a less juicy payout, so people would fall for it less)