Research paper on world of Warcraft- please share your thoughts

Greetings people of warcraft!

i am writing a research paper on the world of Warcraft - addiction and playfulness.

I request you all to Please spare some seconds and answer below questions.

* I guarantee you I will not disclose any private information

1)why wow is addictive? (according to you)
2)How it Becomes more playful and enjoyable with every patch, wow is one the cause of depression in players? And lastly benefits of wow?

Thank in advance! your thoughts will be a great help!