Yes but you keep forgetting, gambling isn't a drug. And also, the main difference between alcohol, gambling and illegal drugs is that they aren't toys. Videogames are toys and if you can't drag yourself away from your toys you have the willpower of a small child. And anyway, anyone who is addicted to the game is a sad individual, which kind of proves my point.
Doesnt matter whether its a physical substance or not... Gambiling isn't a drug yet it has addictive qualities.
I'm not saying WoW is a Drug per se, but that it has potentialy addictive qualities.
Its irrelevant that its a toy - You could make the same arguments about willpower to anything else thats potentially addictive (including Alcohol, Tobacco, Gambling, etc) - it being a toy/game does not change or mitigate the potential effects that it can have on the brain.
I think what more or less proved it to me was when I stopped playing for a few months as I had no internet connection. Jumped back onto my level 61 Warriror, and didn't get the same pleasure out of it as I seemed to be going pretty much nowhere fast.... Yet this hadn't Bothered me when I was playing the game daily.