I'm not sure if it's posted before......
There are many dumb people on servers.......
Just buy Thottbot World of Warcraft: Recipe: Flask of Chromatic Wonder for 4g and sell it in AH for 20-50g
I sold it at start for 50g and only 5 people bought
it and then i relisted for 20g and BAM the gold came in.
I hope i was helpful.