I wonder if there are any serious academic researchers studying it? There was an economist who did some extensive studies of the EverQuest economy around 2002. It was interesting--he could not get any journals to publish his work, but it was the top download at SSRN (and even now, it remains the #6 download of all time there).
I don't know about independent researchers but CCP, who run Eve, employ a full time economist who publishes quarterly reports on the state of the in-game economy.
I renew my subscription every now and again. It's a really interesting concept, but whenever I play it I find that I like the idea of the game far more then I like the game itself. Getting to the point of being able to play at this sort of level feels too much like a job to me, and I already have one of those.