I'm still not sure why they haven't just axed the gil drops from ARR dungeon enemies.

The cultists prior to the first boss in Amdapor Keep have extremely low HP compared to standard dungeon mobs but drop the same amount of gil, which is why they're the go-to for the gil farm bots once they've exhausted the gil from the MSQ. If you happen to get placed into an instance with them, you'll see that they selectively clear out all the cultists then simply leave the instance and requeue.