Why Can Some Men Have Less Grafts and Still Have a Fuller Look?

I am 36yrs old and am considering getting a HT. I need a little in the front and some on top. What are the risks of shock loss in males over 30? I would also like to know why some men receive less grafts and their hair look fuller than some who receive more.

Risks of shock loss following hair transplantation occurs in young men, but Propecia/finasteride usually prevents it.

The value of a hair is not equal amongst all hairs. A fine hair may have 1/4 of the bulk of a coarse hair, so a transplant in a coarse haired person will be fuller (hair for hair) than on a fine haired person. A good character wavy hair will cover better than a straight hair. A kinky hair will have even better coverage. Also, the difference between the color of the hair and the scalp (contrast) has a lot do to with the result of a transplant. Add to that, the artistic skill of the surgeon and the distribution of the transplanted grafts and one patient can have a very different result, all things being equal, from one surgeon to another.