because loot farming is incredibly boring. There's no challenge in it, and even less fun. It's a tedious and repetitive task that eventually burns me out.
SSG: Don't repeat quests too often! You'll burn out ! Do a variety! We made you get little xp on repetition to make sure you don't repeat too much (quests generally only worth doing for xp if you have all of: first time, delving, daily bonus - this is anti grouping in a lower pop MMO !)
Also SSG: Repeat quests a thousand times to farm gear
???