Haven't contributed for a while, so I guess even a little bit is good.
Here's the deal. Instead of yelling to buy stuff on trade chat, go on LFG, then go to deepholm, back, to twilight highlands and back, and finally to uldum. I was buying volatile airs for 30g instead of the 50g ah price just because people who are leveling had them and didn't know the real prices so it seemed like much. Made around 500 gold in 2 minutes. Hope this works for someone.