Making gold in World of Warcraft is difficult for some, and yet comes easy for others. Most people resort to endless hours of farming to make their gold, while others will learn to manipulate the auction house.
Some classes in the game open themselves up well to setting up a service based gold making system. Tanks and healers are always in short supply and make great cantidates for it, saying that you can do your job well. Other classes offer abilities that are in demand for other reasons.
Tanks and healers get off easy in this regard. Quite a few people want to be able to run instances, yet they do not have the time to wait for a group using the random dungon timer. This has opened up a very viable market for these classes as they do not suffer the long queue times that a DPS class will face. On most battlegroups, tanks are able to get into a dungeon group instantly, making them highly desired for this service. Healers tend to have to wait a few minutes, but it is a far cry from what the DPS has to deal with.
Changes are in the works to make it so you will have to actually run the instance in order for the DPS you sell the queue for to stay in the run. You used to be able to simply queue and drop group which simply leaves that group waiting for a tank. Leaving the group now will result in kicking anyone you queued with out of the instance as well making it so you will need to stay to earn your money. As long as you have the skill and gear to handle the instance, this should not be too bad of a problem. Of course your group make-up will have a lot to do with the difficulty.
Mages are blessed in this area as well simply because of the ability to create portals. Depending on the time of day, and the need of the people needing a port, it is entirely possible to make hundreds of gold an hour by selling portals. At its peak, it was not uncommon to be offered 50-100 gold to get a port out of Dalaran. While things have since settled as the focus of play returned to the main continents of Azeroth, the market is stable. The best part about this is that it allows you to work other methods, such as manipulating the auction house, at the same time.
With any luck this has opened you up to looking at your character for prime gold making abilities. Even if you do not use them as a primary form of income, they are great to supplement. I just love playing my DK and selling my services as a tank when I wanted to run an instance anyways. I make money to do what I already want to do. If you look deeper into things you may find other little ways to make some easy money.
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