I’ve heard of this WoW Gold farming strategy before (well I wouldn’t really call it a WoW gold farming strategy but…) and have heard that it can be extremely effective. Some people may not be cut out for it because it involves profiting from other unsuspecting World of Warcraft players. If you have lower than average morals, prepare to make some profit! For this to work you are going to need to use two characters that are on the same realm.

Find a decent priced rare item in the Auction House. Make sure that there are no other auctions of that same item at this time.
Purchase the item and then relist it for a much higher price.
Then log in on the other character and place an ad in the trade channel that says: “WTB <insert item the you originally purchased> for <enter much higher price than what you listed it on the AH for>” 

Now wait for a few moments for someone to check out the AH and realize that the item you mentioned in the trade channel is on the AH, and that they could make profit by buying it from the AH and selling it to you. They will then contact you.
Once a deal has been struck arrange a meeting place to make the trade.
Once you meet up and open the trade window you can confirm that they have the item. Now say something to the player like: “Hold on just a minute I need to transfer some gold to this character brb” 

Then log out and check your other character to see if the auction had sold
As you can see you are scamming someone that was planning on scamming you. They could have easily sent you a tell that mentioned that the item you are looking for is in the AH for cheaper than what you are asking. Well this is how I justify WoW gold farming from other players. Give it a try. I would start with low priced items to start and then work your way up.