To answer the first question, I do. Not because of my ego, but because this is just a fun hobby. The fact that every pair of headphones I own makes music sound different enough gives me simple joy. That's what I seek with each headphone pair purchase: a different audio delivery. Why do I care about those aural differences? I honestly don't know, but they do matter to me enough that I'm here with you guys waiting on drops and stuff.
Now, in my experience, more than 99% of the people I know do not care about audio too much. Their standard is low, and I absolutely understand their mentality. I'm fine with it. Ignoring my preferences, the audio standards of society as a whole, while low, are more than adequate. When stuff sounds ugly, people notice. When stuff sounds good, they also notice. Then comes us, who for one reason or another care to hear everything that will escape most ears. Wide and deep soundstage? They don't notice. Cold, clinical sound? They don't care...because they don't notice.
Do we share a common personality trait that distills in us caring a bit too much about audio even if we're all different personality-wise? I don't want to get too deep, but just wanted to mention this.
Are we hypocrites if we don't apply our high audio standards to everything else in life? Who is judging? As an example, I'm fine with my $30 drip coffee maker. I know a fancy, high-end coffee maker will yield more flavor from my coffee beans with higher heat and pressure rather than with puny hot water drops...but I think the coffee tastes nuanced enough with the cheapy I got. But yeah, I'm conscious of it...that I'm missing out on hidden flavor nuances and that the discarded coffee grounds took with them flavor my taste buds didn't get to enjoy.
Now, I believe there is a point in objective sound quality where music will not sound any better, but just different. BUT...that difference means superiority to passionate people in this hobby, including this guy typing, and who is judging us if we appreciate such superiority? I can't wait to read your viewpoints.