Of course one of the biggest goals in the game is to make money. There are four ways to make money in the World of Warcraft. You can either invest time in tradeskills, play the auction market, save like a SOB, or grind enemies. Money is used to fund equipment and goods early/mid game, and cool status stuff later.
Usually, any class can support itself with equipment and spells simply by selling items on the open market and vendors. But to get to the cool stuff, like level 40 and 60 mounts, rare equipment, and end-game gear, they're going to need more gold than most.
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