Diablo – Is farming Zoltun Kulle more lucrative than the Butcher in Inferno

It's effectively a 'soft enrage' - if you're taking too long on the fight, progressively more of the floor will light up until eventually the entire room is one giant cascading field of burny death.

Every time you have to revive is damage time lost, so first aim to.. well, not die. (Vastly harder than it sounds, I know, but it's still the truth!) Stocking up on ways to deal damage even when you have to run (the Wizard's Hydra, for example) can help make the difference as well.

The butcher run by far is much better, as you get two bosses.

You don't want to start on the butcher phase but the one before it where you kill the warden. What we did was teleport to the Cemetery of the Forsaken clear the fake tombs (If it has 2 levels it is the real tomb). There is usually a special event the Jar of Souls , or the The Matriarch's Bones quest. We would grab 3 stacks then do the event. Jar of souls usually was really nice for gold since there is just so many skeletons you can kill if you have good DPS.

Once we finished we would take the way-point to Hall of Agony level 2, exit to Highlands Crossing then to The Cursed Hold. The Cursed Hold is fantastic as there is just so many easy skeletons to kill that can drop 1K+ gold. Once you free the prisoners the warden spawns in the middle of the map. He counts as a full boss. So because you now have 5 Nephilim stacks. He drops 5 additional loot. Finish the run off heading to Halls of Agony Level 3 and kill the butcher for his normal loot and 5 additional drops due to the Nephilim Stacks.

UPDATE: The other nice thing about those 2 events that I mentioned is both of the rewards require a click to activate. What this means is you can put on all your Magic Find gear then activate the reward.