Playing the game long enough to gather enough gold to buy that item you want takes time. Sometimes lots of time, and sometimes spending it farming mindlessly for hours. This time you're investing into the game is real time (obviously). One could think then that buying gold from a farmer is essentially trading real-life money for time. Time that you would've spent killing mobs for hours on end. While I don't buy gold, and don't approve of it, when I think of it this way I can understand those who do.
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It could also be thought of thusly:
Playing the game long enough to gather enough gold to buy that item you want takes time. Sometimes lots of time, and sometimes spending it farming mindlessly for hours. This time you're investing into the game is real time (obviously). One could think then that buying gold from a farmer is essentially trading real-life money for time. Time that you would've spent killing mobs for hours on end. While I don't buy gold, and don't approve of it, when I think of it this way I can understand those who do.
As a word of warning however, the fink project hasn't yet been updated to work in 10.3. Check their sourceforge page for more info here.