Thou art banned for liking Harry Potter.
You should totally do it! It isn't that hard to win. 50,000 words sound awfully hard, but you can do it. Even if you don't win, you'll still have gotten around to doing that story. NaNo helps you find time for your stories instead of thinking 'someday I'll write such and such'.
Thou art banned, for I am considering doing it this year (why couldn't I have wanted to do it a year when I would have really had time?) because there's a story that's been in my head quite a while that I want to do something with, but it lacks a good plot. I shall have to see if I can come up with something.
You should totally do it! It isn't that hard to win. 50,000 words sound awfully hard, but you can do it. Even if you don't win, you'll still have gotten around to doing that story. NaNo helps you find time for your stories instead of thinking 'someday I'll write such and such'.