Somewhere on a discord far far in the cess pools of the internet is a group of neckbeards getting rich off selling d2 items. And everyday apparently at 9am est (or whatever your time is) they collectively trade all their stuff to each other and then DDoS the mother loving ef out of the servers to force a rollback and dupe all their shinies.
If blizzard were to just admit this was happening we would be less likely to demand refunds and be far more understanding. Accountability goes a long way but megacorps and their lawyer teams never see it that way. Insane.