The problem with your analogy is that people don't own many cars, so when you study people that have a Ford Explorer, that's pretty much it. Games are much cheaper than that, so when you survey someone that plays EQ, chances are he plays a lot of other games as well.
Forgot to mention that Pitch Black was loosely based on Nightfall -- unless it's included in one of the "B-grade adaptations," which I doubt.
The problem with your analogy is that people don't own many cars, so when you study people that have a Ford Explorer, that's pretty much it. Games are much cheaper than that, so when you survey someone that plays EQ, chances are he plays a lot of other games as well.