Thing is, not everyone who uses is a bodybuilder. I did my cycle at 14% and for me, my goals, my age, and my frame thats a decent number. At 12% I get comments at the gym about how ripped I look but outside of the gym I get comments on how gaunt and skinny I look. Personally I prefer to carry a bit more fat than that. It has nothing to do with discipline - I had < 10% bf consistently for a couple of years to prove to myself that I could do it. At 15-16% I get a lot of female attention and respect from men (and some who posture around me, lol - love that).
I don't do this to please other people but its interesting to hear what people think of you. Lots of time it doesn't match up to what we think of ourselves.