For anyone who watched the show, it did show balance. The point being, some people have addictive personalities. You can be more prone to becoming addicted to something. And when this compulsion, replaces all other "hygiene" factors in your life (eating, washing, socialising etc), it is dangerous.
To use some of the extreme examples above (though I've not heard of anyone reading books at the expense of all other things), it would be of a similar concern.
Being an ex WoW player, the pressure is also not solely produced by the developer, there is also the peer pressure aspect of the Guild. In order to get the best items (and let's face it, who wouldn't want the best things), you have to be in a guild, raiding 5 times a week of which YOU WILL BE ONLINE AT X GAMETIME OTHERWISE WE'LL BOOT YOU OUT....