Well actually, irrespective of this exploit being an old bug or not, the people who took advantage of it must have known full well that it was not the game working as intended. Just because temptation is there, it doesn't make it right to break rules. Doing what they did is still dishonest.
I'm certainly not quitting this game. I am annoyed that people used an exploit though, so I hope they will get their just desserts, people being dishonest is not PWE's fault at all.