If you have such an issue with the way others are utilizing the freely available public resources why don't you speak to the management. My guess is they really aren't too concerned because first, the person is a paying customer just like you, and second, online games like World of Warcraft actually don't eat up as much bandwidth as you think they do.

Sounds like you're being a bit hypocritical here as well. The gamer only hangs out at the coffee shop a couple times a week, while you are hanging out looking for people to blog about much more regularly if you know his schedule.