It's research.

Here I am, writing a fight scene where none of the characters are working together, and the only thing that's saving them is that the bad guys are using a new tactic they don't know how to take advantage of, either. And I'm thinking, "You know, I know exactly how they should have handled this...because of the (admittedly miniscule) experience I have running with CoX groups."

That's right, folks. MMORPGs aren't just fun, they're research.