Due to wanting to progress together with my friends who are a teeny bit slower, I've not wanted to progress past into Inferno. I have a lvl 60 Barbarian who is sufficiently decked in Inferno-Act1 ready gear (resist all, defense, etc) and so have no problems surviving Act 3/4 Hell solo even if I switch out some gear for MF/GF gear.
I've been doing Siegebreaker runs with 5 neph valor (bridge of korikk + caverns of frost or depths level 3 until 5 stacks + siegebreaker) which got a little boring. I continue onwards past Cydaea and Azmodan sometimes but it's a fair bit of walk starting from Siegebreaker.
So my question is, which is the most profitable gold farm spot for a Barbarian in Act 3/4 Hell? This question is specifically for Barbarian considering we are NOT ranged (i know there are some nice spots for DHs/Wizards, don't they all) and also considering Grim Harvest might have some use ...