I actually think they mostly fake it. Whenever I see a live video of Skrillex for example he's just twisting knobs and jumping around. I don't really think it matters though because the people going to these concerts aren't there to see someone perform for real. They're there to hear it live and see the person who performs it. Daft Punk performances also seems more like a lightshow than a concert to me.
Our resident novice reminisces on her middle-school love affair with the epic fantasy romance.