Ran Zul'Aman with a guildie. Our guild has the cash flow perk.
We noticed that when converting people from frogs or releasing the prisoners that drop lootable gold patches instead of 5/10% of the gold we looted going into the guild bank, the same amount we received was going into the guild bank.
So you can run this, kill trash, convert frogs, reset and repeat. Then pull the extra cash you get out of the guild bank.
In one run which took approx 30mins we killed all bosses, made over 300g (including the cash transferred to the guild bank) not including the greens/blues/epics we picked up and can vendor to the vendors you release.