Miscellaneous RPG Research Reports Out There
Much larger list of projects here: http://rpgr.org/documents/list-of-other-rpg-research-projects
Breakdown of RPG Players - A 2-Axis Analysis of a Survey
WotC Adventure Game Industry Market Research Summary (RPGs) V1.0
Role-Playing Games: The State of Knowledge
UK-based Strange Agency has launched an analytical report on role-playing games. The agency used a sample of 272 RPGs to determine key selling points and new game potential. Its report, titled “The Empirical Analysis of the Role Playing Game (RPG) Genre for Video Games” also investigates the way technology influences game design. Future report topics from Strange will include "The Anatomy of Franchises" and "Games and Popular Culture Index."
The Psychology of Massively Multi-User Online Role-Playing Games:
Motivations, Emotional Investment, Relationships and Problematic Usage