Let me start off by saying that my black ass don't mess with heights, so I wouldn't be NO WHERE NEAR any of those places.
That being said tho, those CaCs are enjoying themselves. The adrenaline rush, they get from doing stuff like that must be crazy.
Again, I'll never know. Not 1st hand anyway. But it does look fun for those with a adrenaline kink and no plans for tomorrow.