Idk how this poll makes sense. This seems like it was started by someone who has no clue on how to make gold and was looking for free insider tips. None of the methods listed, alone, would make very much gold in the spectrum of the volume of gold that moves on a realm in a particular day, let alone the current total amount accumulated at that point in time per player on the realm. And all of these methods are only parts of a whole. "Which of these methods is better?". Why not do all of them? 
