2) Put paper in a file and come back in ten years and bugs & vermin have gotten to it, there's been a fire. Your paper no longer exists. I suppose acid free paper might help, but I've only heard about it, I've never seen it.
3) People have been editing paper for years. Look at all the trouble the banks go to secure checks and make sure people don't edit them.
They've figured out that people attending these events aren't going to take anybody's broadcast revenues by sharing on social media. It's about sharing the experience with their friends and family. A picture, or video clip, that shows...I was here!! This helps build up the hype, viewership, and attendance overall.
Scientists will study your brain to learn more about your distant cousin, Man.