I know that Trade Prince is know for 2 long now, i'v used to farm him but tonight as i was going to bed i came to an idea.
Tested it few min go and it worked. So here it is
Ok now I will try to explain.
First for all of you that dont know location. Location is in Azshara at Pleasure Palace
My first kill, i got 80+ gold
Now here is the trick. If you have battle=tag friends on different servers they can inv you to group and you will be ported to thier server So I asked friend to do so and it worked. You see him again and and only 90sec have passed
Just a picture showing amount of gold i have had before i looted him. Sorry for the fail in screenshot, but you can see number if you look closer
And picture after i looted. For this kill I also got 80g. So thats about 160g ( looted ) in 2.5min
So here is step-by-step guide.
1. Get to his palace
2. Clear 3 bug mobs that are close to him ( just in case )
3. Kill him and loot him
4. Fly up so u dont pull mobs and him
5. Ask a friend from different server to inv you
6. When u accept invitation you are transfered to his server
7. Donais is up
8. Kill him and loot him
9. Leave group
If you have 5+ Battle-tag friends on different servers you could kill him without downtime and w8ing for respawn that 5min+ so Basicaly you can kill him 3-4x more during same time.