as ridiculous as it seems for someone to be walking around with a comb over like that it is exactly as Hersute says. he will have started out merely moving one bit one side, parting it differently, growing one section a little longer.

i'm guilty of doing this myself although I'm nowhere near as far down the line as the poor guy you saw (at least i hope i'm not). I started by combing the hair down at the sides to cover my receeding hairline and once you've started to try and disguise the baldness to ANY extent there is no easy place to stop doing that. the more time and effort you take to disguise it the more, the more bald you are in reality so the transition most people go through from losing some hair to shaving it all off becomes harder and harder because you've got so good at disguising it that nobody would think you've lost so much hair. so you carry on concealing and disguising because you've now missed the boat in terms of shaving it off and it being an easy transition. in a lot of ways that's why i've chosen to wear (ordered my first custom this week) because despite telling myself since i was 18 that if it got too bad i would just shave it off, here I am at 30 still using consealers, still combing it strategically, still locking it down with hairspray so that it doesn't move about in the wind and still cutting it myself in order to grow certain bits longer.

Thank god I came across this place because no matter how much I may laugh at these people myself and think how ridiculous they look and why they don't just give in, chances are i could have been one of them in another 5 years because it was just too damn difficult to shave it off.