There are plenty of things that the average gold buyer (who is almost certainly not some intrinsically evil person) probably never takes into account when they purchase gold from a farmer, aside from what shiny new armor it will buy them; they could care less what it does to the economy of the game. Then, there are those who actually believe the practice of gold farming is healthy for a virtual economy, and for people coming from that school of thought, Luster makes a convincing case why, in the end, everyone suffers from the actions of those few. Not to mention the connection he makes between the largest network of online gold-selling sites, and a trio of convicted child molesters.
It's good readin'. Check it out here. Thanks to Sean for the link.