Preparation:
Start the Storymodus & pick the Quest Sword of the Stranger (Act1, Quest 5.2).
You should create the game on T6 on a Lv70 Character.
Look out for the Dungeon "Khaz" in the Fields of Misery & enter it.
Run towards the yellow dot on the minimap & kill the boss and the white mobs around him aswell.
When the boss is dead, another set of around 10 white mobs spawn. Kill them aswell.
Once all mobs are dead, click the sword piece & go back to the town.
Exploit Part:
If you went solo till now, invite your friend(s).
One person wont get any XP or Gold, I call it logout person in the following, opens the logout menu via escape.
Once the logout person has opened the logout menu, another person can talk to Cain.
When Cain starts speaking NOBODY IS ALLOWED TO PRESS SPACE OR THE ESCAPE BUTTON and the logout person should log out NOW.
After the logout person logged out, the quest is auto completed & all the people (leechers) should log out now aswell.
As soon as all people logged out (the parter leader can check that via the Game Settings Menu. When he cant acces the Game Settings, someone is still ingame).
The parter leader now resumes the game, the logout person opens the logout menu again & someone can speak to Cain again. As soon as Cain starts speaking, the logout person logs out & thats it.
Repeat till your desired goldamount/level.
One run takes 10-20seconds & grants 120k gold/18mio xp on Level 70.
You get 60mio xp/minute, 480k gold/minute & 3.2billion/hour, ~28mio gold/hour.
If you have any questions, just ask
This is the detailed guide on how to do this. I wrote it myself. PM me if you got questions about it.