Uhm... usually they try/hope to avoid being noticed by the community for obvious reasons 
This is where the brain in my head starts to hurt. As Lusche stated, it can't be to get recognition, because people in here seem to have a shocking capacity for boredom to look up the kill stats of other players. The only thing that makes something approaching sense is, do they do it to be able to control CVs?
I guess I just want to know, if everything goes exactly right and according to plan, what does killing a shade get you?
Wiley.