I think they should lean more towards the system they discussed recently having them do a random effect. If having them do something random is such a terrible thing maybe they could tweak their system a bit and allow u to flat out choose which type of effect it is and just have the number or amount of effect b random. Being that blizzard is trying to find multiple ways to have ppl pour gold into the game and keep trade going they could easily add a monetary aspect to it with an npc that allows an increased chance for a particular effect to come out of it etc. Theres so many routes they could take on this, its hard to have this poll give a real answer to the problem. =/
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