For me, its primarily about the feel and comfort. I like shaving my head against the grain at least once daily and I like the feel of being completely slick (with a lot of glare also!) A lot of that comes from serving with the infantry and living almost indefinitely in the field. Being totally bald makes hygiene a heck of a lot easier and for me, meant being more comfortable. I think we all have to admit, the feeling of being a completely slick bald man is unequaled.