This is super easy and 100% legal, no hax, exploits, scams, etc.
Step one: Learn Tailoring and Enchanting
Step two: Level your Tailoring to at least 215, and your enchanting to at least 130
Step three: Learn how to make "White Bandit Mask" with your tailoring. It's a recipe that drops not very often but doesn't sell for much in AH so it shouldn't be any trouble getting it.
Step four: Buyout as many mats for the mask as you can on AH.(shouldn't cost more than 1g for this.)
Step five: Dis-Enchant all your masks and sell the Vision Dust, Lesser Nether Essence, and Small Radiant Shards on the AH.(80s Average for Dust, thottbot says 26g for essence but i think that might be messed up,and 8.86g for the Shard.) You will be getting a little over a 1000% profit as the mask costs usually about 70s to make.
There is a person in my guild that takes advantage of this and one day had about 3kGold in her mailbox just waiting there for her. She was nice and gave 1k of it to the guild bank and then used the rest for her epic flyer. In fact, she is the one who showed me this.
hope i can get some +Rep for this =D