I once PM'd Telamon (I usually decide to PM Telamon first, before opening up threads. That's what he prefers, I think) and the answer was something like: Youngs used to steal the money from monsters without being attacked... which honestly, is the least important issue on this shard. Without causing respawns thats pretty low numbers, we are talking about. He wanted to change it then (6 months ago?), but must have forgotten about it. The reason I decided to open this thread and remember Telamon of the issue is, because of the topic's actuality due to the halloween overworld spawn there and players farming hcoin of from the mini-boss spawn.
The Ocllo dungeons are not meant as a non stealable region, and it will return soon. We had a problem with young players stealing from the monsters without any risk. The skill was disabled until we address this. (New player would go farm, and find a dungeon full of monsters with no gold)