Follow this easy guide for an exploit to get free gold!
Simply go to The Oozing Dark and clear it out. DO NOT kill the guy who tried to kill you.
Next, talk to the guy with the Crimson Cloak, and choose the "nice guy" option. You will get 50 gold free. Go back in again, talk to him again, and he will keep offering you gold. Repeat this second step and each time is a free 50 gold.