David Blaine’s new crazy stunt

I read today that David Blaine begins an upside-down stunt. His latest challenge is to try and hang upside down for almost three days.  For me, I just don’t get the point, why would you do the kinds of things he does, previous things include spending 72 hours in ice, seven days underwater and 44 days without food in a glass box.  Surely that isn’t normal?