If this is true:

The Gross National Product of EverQuest, measured by how much wealth all the players together created in a single year inside the game. It turned out to be US$2,266 per capita. By World Bank rankings, that made EverQuest richer than India, Bulgaria, or China, and nearly as wealthy as Russia. It was the 77th richest country in the world. And it didn't even exist.

[from Flat Rock]

Then this was inevitable:

The macros for World of WarCraft, for example, control a high-level hunter and cleric. The hunter kills while the cleric automatically heals. Once they are fully loaded with gold and items, the "farmer" who's monitoring their progress manually controls them out of the dungeon to go sell their goods. These automated agents are then returned to the dungeons to do their thing again. Sack's typical 12-hour sessions can earn his employers as much as $60,000 per month while he walks away with a measly $150.

[from 1up.com]

The entrepreneurial bent of Xers does have its unpleasant side.