I recently handed an expensive set of cans to someone with unpolished tastes. He turned the music up so loud I had to warn him, not just for his hearing but for the prortection of the headphone.
Here's my common-sense answer to the question.
A lot of idiotic impulses go back to cheap equipment. When the five-and-dime stereo does a poor job of reproducing good bass and treble, the easiest way to wring it from a mid-heavy presentation is to crank up the volume. Midrange is the critical frequency region. It's the survival band. It's what we hear most of the time. It's what we, as a species, have needed to hear for our very survival. That's why you can hear and understand TV and radio from crappy little speakers that barely squawk. It's why you can hear music off the microspeaker in an iPod Touch.
We crave the bass and the HF extension, but not for the soul of the music. That's in the midrange. We crave it for the extra presence it provides. It's what tells us we're not listening to a clock radio. Sometimes, mids are recessed simply to allow more bass and treble to create a kind of EQ smile. People who can't pull this off just crank all of the music up louder and louder in an effort to get what they want from systems that are poorly adapted to do very much.
I'm not much of a builder, but when I built my system, using the best components I could find, I found that the signal separation of a good system makes it unnecessary to "crank it up." I went a little heavy on the woofers (a pair of 15" woofers and a pair of 15" subwoofers, with a pair of 500-watt subwoofer amps) only to discover I didn't need all that. When you have more than you need, you don't use half of it. The same holds true for tweeters (I once had 14 tweeters - 7 per channel - before it became obvious that I'd hit overkill and then kept going). With my L-Pads, I don't even use most of the power my tweeters are capable of, simply because it would interfere with the mix.
People who have few, if any choices, use quantity to substitute for quality.