I was doing the daily quests with my hunter, lvl 78, in Zul’Drak, when somebody gave me a great tip! With this tip, I managed to get a lot of experience points, and to make quite a lot of gold in only five minutes.
Go to Voltaris (still in Zul’Drak) at about 27,45. The gheists have their respawn spot there, and they respawn really quickly (not as fast as he said, but fast).
I stood there for 5 minutes, and I made 17,618 XP and 1 Gold i cash, and got a green item for a market price between 16-20 gold.
Not bad for five minutes “work”.