Here is a blog of a guy who used to be more hardcore about World of Warcraft than I ever was. Thankfully, I'm proud to say I barely even play 1-2 hours a week now when I was playing 5-7 hours a day 7 days a week, even all day on weekends sometime.
The biggest part of the addiction is the game doesn't end, you can not win it. Just when all of the people who are very far in the game think the end is in sight Blizzard will add new content to keep them going.
http://soulkerfuffle.blogspot.com/20...-from-top.html
Threaded Mode