I think it's time we combine our awesomeness and create a dedicated thread where people can find tips and tricks on how to farm gold.
If you have any special place or way that makes your gold farming easier or more productive, please share it with us.
I will contribute with 2 special places i find amusing and lucrative and we'll see if we get a trend going
NPC abuse
The first place is located in Act1 just outside of The cursed hold in a small zone called Highlands Passage. The easiest way to get there is to take the waypoint to Halls of agony level 2. Once there, work yourself through the instance until you reach the entrance to Highlands Passage.
When you have arrived you will be encountered by one out of two possible scenarios.
Scenario 1: You will find a vendor called Kyr the weaponsmith, he will offer you a small side quest where he wants you to kill the cultists and their leader Dargon. Dargon is accompanied by an elite group of ghouls, these elites can be hard but it's doable. Kill them and claim your spoils!
Don't forget to visit Kyr as he sells random blue quality items and occasionally one random rare item, these can sometimes be sold for quite a bit on AH. When you're done just go through the entrance to the cursed hold, there you will get an automatic checkpoint save.
Now you just have to relog to reset the scenario and walk back to Highlands passage (which is really close with your new checkpoint) and you can farm Dargon and his elite pack easy and endlessly.
Scenario 2: Kyr won't be there to offer you the side quest and Dargon and his cultists will also not have spawned. Instead you will find yourself in a sea of Goatmen and a new vendor called Radek the Fence. Go check the vendor for possible profitable items and sell them on AH.
Fields of Slaughter
I have found that Fields of Slaughter in Act 3 is a very good place to farm elites, champions and lesser mobs for gold and treasure.
There's not much to say about the fields of slaughter as it's simply a meat grinder zone and the only thing you have to do is, slaughtering and looting. Depending on your gear and difficulty it will take about 5-10 minutes to clear the zone and it can be very profitable for very little effort and time. On Hell difficulty i usually get around 20-30 k gold in one clear, not counting the items that can potentially drop and sell for good gold on the AH. With a bit of luck you can make a small fortune within hours.
Hope this was helpful to someone