GameSetWatch, the alt.blog on CMP's Gamasutra network of sites, has up a discussion with a gold-farming boss. "Mr. Smith" is one of the owners of a gold-selling site, and submitted an article looking at the current state of the virtual currency market - from his perspective.
Smith makes two interesting points in his discussion: that power-leveling is now the 'growth industry' for RMT services, and that the newest workforce in the marketplace is ... wait for it ... North Korea.
The cost of these power-leveling services has also dipped considerably as new players enter the marketplace. Competitive pressure has dropped the price from about $6/level to more like $2.50/level in World of Warcraft. All 70 levels now averages about $250, down from a high of almost $500.