WoW in-game economy

There is a massive banking and auction system in the game where players can auction off items for a higher price and profit. They use silver and gold to define the amount you have and depending on whether or not you're in a guild, you could pool in your money to buy things for the guild. I think one of the biggest concerns about the gold in the game is that it reaches into the real world, like Chinese gold farmers. It works exactly like Wall Street trading, where the prices of items in the auction fluctuate and the cost depends on the availability. Essentially a player could earn a large amount of gold if he follows the patterns for certain items and sell them accordingly, very much like auctions in real life, a smart deal could make you millions.