5 Massive World of Warcraft Money Makers

One of the secrets to making big money on an ongoing basis with the Blacksmithing professions is to make items that need renewing. By doing this you will eventually have an ongoing flow of revenue. A couple of examples of expendable items Blacksmiths can make are sharpening stones and grinding stones.
Secret #2 - Enchanting
Another profession that can make some decent gold in WoW is Enchanting. You'll find that there is a huge market on all servers for enchanting materials such as Shards and Dust. To make the most profit with this profession you should consider focusing in disenchanting instead of enchanting.
You can use your disenchanting skills to make stacks of materials for other enchanters that are too lazy to get them themselves.
Secret #3 - Engineering
Like Blacksmithing, the best things to make as an Engineer are the items which are regularly used. Bomb's, Explosives, and Fireworks and great examples of these.
Secret #4 - Small Pet Vendors
For some reasons WoW players love small pets, this creates a unique opportunity for you to make money in WoW is by selling small pets. Simple travel through Azeroth and pick up as many small pets as you can, then sell them in the Auction House.
Another way that you can use pets to make money if by farming the, Rare pets such as the Dragonhawks and Drakelings sell for big profits.
Secret #5 - Instance Runs
There are a good number of instances in WoW that can be used to farm green items. Sell these in the Auction House or disenchant them for the materials they provide. Once you've reached level 70 or above you'll be able to instances alone, you can make a lot of gold by doing this.
The 5 tips mentioned above are simple but can be very profitable if you're willing to dedicate a little time to apply them. Always remember that if you want to be mega rich in WoW - you'll need to be prepared to work a little for it.