I completed my diploma thesis and are waiting for my result. Right now I am preparing for my final exams. I will have completed my studies in March 2009. I will prepare a summary of my findings then.
In short: There were huge differences in demography and play style between the Hardcore Game Player and Casual Game Player audiences. There is not just ONE computer games culture. Gamers associate different functions and meanings with gaming. Generally restrictions (like income, time, experience with input devices and games) are less relevant when choosing which games to play than preferences (like attitude towards violence in games).
Edit: I was awarded the mark „very good“ on the thesis.