Useless Dungeons

[Avaloon2]

Lets talk about Dungeons (old R1-R5) in this game.
What is the point on having them?
Example: map Rima, dungeon Demis Lair
mobs inside got like 200% more hp
and thats all

while same map: Rima
we have quests for 8-12%exp for every 50mobs

If dungeon is in Rima map, why mobs inside don't drop quest items from Rima?

The "Secret" PLAN was for Titel and HERO Insignia farm but the Insignia droop is really bad have not see 1 Insignia and i have killed 2000+ mobs^_^