The U2 Stage is so big and complex you need more cameras for coverage.
U2 security and venue security no longer stop people from shooting video, how can they when so many people are doing it. Digital cameras have become so good that we all used small point and shoot cameras.
It may be a matter of taste but I use 5-7 cameras when I am filming small club bands. They are paying and it feeds right into their egos to know they have alot of cameras rolling. Makes them feel they are getting their moneys worth
With regard to editing, I get what your saying about wanting to hold shots and that is great for jam bands and prog rock but I can tell you from dealing with all sorts of music that 98% of the time they want these fast rapid edits to add excitement to the video. I try and strike a balance
Here is an example of a recent official shoot:
Bitch(rolling stones cover)
http://www.youtube.com/watch?v=BCLm7lONcgEWhen i showed them the 1st draft the only thing they asked for was MORE CUTS