I can tell from your mug in your avatar.
Actually, this has turned into a good discussion, except for your pot-shots and insults.
Who asked you to be a sheep? If it doesn't make sense to you, then don't do it. People should do it when they are frustrated by their hair being pulled, or poking through things, etc., not because "everyone else is doing it". If you have to ask...
This isn't about me; I'm not even considering taking up the practice, as I've explained earlier. I'm just trying to understand the origins of it. I think I get it now, but like I said earlier, I'm not competitive enough or pushing the envelope enough to worry about it.
I came in with the idea that people did this for aerodynamic reasons, which seemed BS to me. Now I know it has more to do with road rash and tight-fitting clothing. I learned what I wanted to learn.
I kinda laugh at the idea someone mentioned earlier that anyone can buy an expensive bike, but only a hardcore, competitive racer will shave his legs. If I'm a poseur and spend several thousand on a bike and racing outfit, why would shaving my legs be a big hurdle?