Ladies and gentlemen, it seems a new exploit has just entered the building.

What's different about enhancement scrolls is that the same scroll is used during all stages with different % chances. It might be possible to trick the server via PE into thinking that the item rank's at 0, hence the scroll working at 80%. That is, if the check of the rank isn't done server sided or can easily be manipulated. You can argue that people can bypass the number of upgrade slots available and infinite hammers. But yea, it's just my own guess. Yellonde hasn't suffered from crashing to enable duping, right? Even though it's highly improbable, but who's sane enough to keep enhancing like that?