The idea is in heavy EDM, dubstep and the likes, there's so much highs it's hard to tell if a track is distorting. So they distort 0.3dB or so on the master to get that little bit of loudness. As Deadmau5 once said: “I don’t hate it for the culture, I love it for the culture. I don’t hate it for the artists. I hate it for the f***ing sound. The sound is like a "f*** you" to every audio engineer in the world because… kids go out and they want it loud, loud, loud. You’ve got a volume knob for that, dude. And if it’s not loud enough, buy an amp and some better speakers.”