Hunter Improved Heart Of Fear Farm, 30K hr+ Possible (Patreon)

The marksmanship hunter has an ability called "Explosive Shot" which fires a projectile from the hunter's weapon and triggers when the user activates it remotely.  This ability bypasses physical barriers completely. 

This ability often be used to exploit trash in dungeons by aggroing mobs you would not normally be able to access without killing bosses, thereby creating greater farming profits. As an example you may to review an example of this in my hunter exploit guide :                                         

https://www.youtube.com/watch?v=Wmak7I3usm8&t=368s

In what is regarded as the best place to farm spirits of harmony and to some extent the best gold farm in the whole game, Heart Of Fear, there is a practical opportunity to do this.

The normal way to farm Heart Of Fear is to run through the first wing of the instance clearing the trash up to the mobs directly around the first boss, then resetting the dungeon. An exploit I developed to speed this process up by eliminating the run-back involves queing for the proving grounds scenario, teleporting out of the scenario, then farming HOF and using a teleport back to the proving grounds to return you to the outside of the HOF instance.

We can extend the number of mobs we can kill before instance lockout by using the explosive shot technique mentioned above. After clearing the mobs on the first floor go to the (still closed) portal connecting to the second boss. 

Type /target set'thik tempest. A mob's nameplate should up through the wall on the right. Fire the explosive shot through the wall-it is surprisingly easy to do this after a few tries. The mobs around the one you've attacked will now aggro through the closed portal. Kill them and loot them.

Now type /target kor'thik silentwing , again a mob should show up on the left. Repeat the process above.  This adds about 10-15% to your total profits per run.

When you are about to hit instance lockout bear in mind you can use the technique posted at ownedcore by ergosumbi:

 http://www.ownedcore.com/forums/world-of-warcraft/world-of-warcraft-exploits/560494-unlimited-hof-trash-farm.html

 to reset the trash to extend your hourly profits.

Overall HOF is almost ridiculously profitable to farm. To show how profitable in this video WTBgold estimates the profits with crafting to be 50K gold per hour:

https://www.youtube.com/watch?v=V1PbD_esQ8s&t=398s

and of course WTBgold does not use exploits. I find his estimate to be exaggerated because I don't believe transmog gear is practical to sell for most people in a reasonable timeframe. 

That said, using all the above techniques 30K per hour is certainly possible.