To this article from Cracked, I would simply add: addiction is not only nurtured by video games, but by any giant industry driven by personal consumption which can get away with it. Addicting your customers to your products is a great capitalist business model.
This is why I haven’t included games like Guitar Hero in this article. They’re addictive, sure, but in a way everybody understands. It’s perfectly natural to enjoy getting good at something. Likewise, competitive games like Modern Warfare 2 are just sports for people who lack athleticism. There’s no mystery there; everybody likes to win.
But these “hit the lever until you pass out from starvation” gaming elements stray into a different area completely. As others have pointed out, the point is to keep you playing long after you’ve mastered the skills, long after you’ve wrung the last real novel experience from it. You can’t come up with a definition of “fun” that encompasses the activity of clicking a picture of a treasure chest with your mouse a thousand times.