GOTEBORG, Sweden, July 1 /PRNewswire/ -- First Planet Company, developer and publisher of the largest real cash economy MMORPG, and Florida State University researchers announced today the results of a new study on virtual buying habits. First Planet Company and business scholars at Florida State University and The Stockholm School of Economics have partnered to develop answers surrounding buying habits in virtual worlds.

http://newsblaze.com/story/2010070105060200001.pnw/topstory.html

tl;dnr: If you're really into an MMO you'll buy stuff.