I listen exclusively to headphones, because in order to attain the same levels of sound quality and satisfaction via a speaker-based system would cost me trop beaucoup de dollars. Right now, I have a CD player running straight into a headphone amp, straight into headphones. Because of the simplicity of this system, I can (and have) spent my money on the highest-quality stuff I could afford.
If I had to deal with a pre-amp, amp, speakers, additional interconnnects and speaker wire, I'd have to either knock over a bank or live with less enjoyable sound quality (or both). Not to mention the troubles associated with speaker placement, sweet-spot sitting arrangements, room acoustics, etc. With my headphones, I get the best possible sound whether I'm standing, sitting on the floor, or laying in bed.
I guess all of this makes me an audiophile. The music is of primary importance, of course, and much of my music sounds horrendous, recording-wise, but I still want to hear as much of the musical truth (i.e. EVERYTHING on the recording) as I can.
Let's face it fellas, sound matters. Otherwise, we wouldn't be here!