And ostensibly, one would expect clever characters who know of Mau's enchanted staff to be wary of the Goddess getting pissed if they messed with it. OR, of Mauja's launching a full assault should someone steal it and getting all of Helovia involved to getting it back.
So while yes, you worked hard and were rewarded with something, that in itself isn't a reason that you should be exempt from the rules of the game, i.e. still being able to have your things taken.