In order for this trick to work you need to have a lootable chest that only 1 person can view at a time.
This works with Ultraxion's chest and Madness chest only
To get all the gold from those chest what you must do is be the first one to open the chest but make sure you don't have auto-loot on or it wont work.
Ultraxion's chest requires patience and a good memory cause you wont be taking the gold right away. Be the first one to open chest and make sure gold doesn't get passed out. You have to wait for other people to start the encounter for warmaster while the gold is still in the chest since everyone gets ported to the ship the chest will remain at the temple with all the gold. After madness is downed make sure you wait for everyone to leave the raid group. Since you are the only one in the raid zone, head back to ultraxion's chest. This chest usually has about 400-500 gold.
Madness pretty much the same thing except you dont have to wait that long since the raid is over you just have to open the chest and hold the gold till everyone leaves. after everyone has left loot the gold and bam another 400-500 gold
Tips on trying to be the first to chest
For ultraxion at the end just don't worry about doing your role this even includes tanks. Head towards the spawn location since most players are grouped up in the middle you should be the first one.
Also since there is a cut scene make sure you escape out of it immediately and reopen the chest.
For madness pretty much same thing as ultraxion since the chest isn't available until Thrall uses the lazer beam of death you have time to head there. There is a cut scene right after thrall uses the beam so escape and reopen the chest as fast as possible.
This can be done many times in the week since the gold isn't a once a week thing like loot or VP