The Perfect World forums have details on a rollback in Neverwinter after the discovery of a bug that some users exploited to their economic advantage in the beta RPG. Noting that damage to the game's economy had already been done, they rolled back user accounts to undo this, and offer this FAQ with all the details on the process (thanks Polygon). This brings to mind the recent exploit in Diablo III that also impacted the economy but was not rolled back. There is no proper way to judge the impact of the problem on the game, however, because Blizzard was maintaining an artificial floor in selling gold for cash of $0.25 per million, a limitation they removed just a week ago, so there's no way of separating the impact of the exploit from the impact of removing their price fixing. But for the record, according to this Gold Price Tracker the cash price of gold in Diablo III has dropped close to 1000% in the past week.