Wasted Energy?, Energy at a Major Concert Options

Be Well All..This question might be in the wrong area so I do apologize.. and if this question has been asked in the past..just blame it on the new guy! In a concert setting regardless of the rock band playing (or does the band make a difference?) With all those loyal fans screaming at the top of their lungs A Great Amount of Energy is being expelled..and with such a large crowd focusing that energy flow, who is the absorber? Or What..

I would venture to guess it's the person performing on stage. I know a lot of performing artists and musicians, and a lot of them actively feed off that energy. I don't think it's something a lot of them are consciously aware of, but many times there is a distinct difference between their stage persona and their real one--many times the real one is very draining and hard to be around, because they're so used to sucking energy off people.