Arcanist Doan in Scarlet Monastery is a well rewarding boss. He drops some very nice loot that you can probably use or sell if you prefer. Hypnotic Blade sells for 1 gold 27 silver, Illusionary Rod for 1 gold 59 silver, Robe of Doan for 40 silver and Mantle of Doan for 30s. Arcanist Doan is a level 37 boss located in the far right SM instance. Would be an ideal mob if you are level 40 rogue, thus you can just stealth your way in.
Arcanist Doan is immune to cheat, you can start by using Ambush or Garrote. He castes Arcane Explosion often which hits for about 200 damage. Be sure to have alot of hit points. When his hit point reaches 50% he'll put up a blue barrier and charges up Detonation. It hits for a whooping 800 damage, be sure to run to the other side of the room otherwise you're going to get hit hard. To avoid this, engage the fight while he walks to a corner of the room. You will have around 5 seconds to jet to the other side before getting hit. An important part during this portion is to use first aid while he's busy casting Detonation. Once he's done casting run around for your first aid to finish up healing before charging at him again. Now just charge back at him and finish up until he dies, use a potion if needed. He will drop 2 of the 4 items mentioned above. It’s 2 gold per around which takes about 5 minutes. That's 24 gold per hour.
Now just hack at him, use a potion if needed, until he dies. He'll drop 2 items: a Hypnotic Blade/Illusionary Rod And Mantle of Doan/Robe of Doan. Goes for about 2 gold pieces per kill. It takes about 5 minutes for this whole sequence. So now we wait an hour for the instance to repop? NO! Here's a neat trick. Make sure you have a bot or a friend in group with you. He can be anywhere on the other continent if he wants. After you kill Doan and come out of the instance, have him make you party leader, then he leaves group and invites you again. The instance is reset with a new Arcanist Doan. I can easily average about 20 gold per hour.