Well, when bugs like these come up and people discover them, and then exploit them. Many, many people do this and Anet just won't delete that many accounts.
Exploiting the drop bug nets about ten times the normal amount of loot. I'm assuming that ANet will label that an exploit.
My SS used to farm by soloing mobs while their fought each other. The big difference now with the drop bug is I get all the drops regardless of how much damage I was responsible for.