Some of those permissions it would need, like camera, microphone, pictures/files in case the fan wanted to post a photo onto the fan wall. You can tag your location in your posts if you wanted to, so, 'location.' You can also 'share' your app use with your friends from within the app, so then it would need your contacts.
I don't know about some of the other stuff though.
Mandatory registration wasn't required for me, I found the invisible 'skip' button in the upper right corner of that screen.
But, yeah, it's all about data collection and learning about the fanbase. I don't think there are sinister intentions behind it though in this case.
Still, I have a separate pre-paid phone that I use for these social-media type activities. There is no real-life contact info or personal data on it, so life continues to be peaceful and serene.