Why do you want to turn it up?
The music is on, you can hear every detail clearly, you are 'in the groove' (tapping the feet, playing along on your air guitar, 'air conducting' or pretending to drum along), so what does cranking it up even louder get you on top of the enjoyment you are already having?
I don't mean turning up something from 'background level' so can you hear it more clearly. No, I mean when it's already loud enough to clearly hear everything on the recording and engage the emotions, but you have to TURN IT UP until the speakers are hitting the end stops and discomfort sets in. (I also don't mean turning it up because your listening position is 25 feet away from the speakers in a huge room.)
What is achieved by the extra volume?
After the recent ADM thread - where sustained volumes levels of well over 100dB were being discussed - it got me thinking of why it is so important to have the ability to play music that loud. (Someone must be doing it or manufacturers wouldn't be making the kind of domestic kit that can go that loud without breaking.)