So Furball, do you let others do your killing for you or are you a Vegan?
If you subsribe to the hunter / gatherer origin of our species, and primative tribal cultures still in existance today tend to back up that theory, then there is some satisfaction in bringing home some meat for the dinner table.
It is deeply engrained in our psyche, some stronger than others, and gets mixed up with a bunch of other stuff. Some think the big game hunter trophy mentality has to do with proving you are a better provider and guardian, so you are therefore more manly and thus more attractive to the females.
Obviously, when we are isolated from the hunting culture as we are in modern society, the motives are not as clear but the primal urges are still there.
Like a dog having fun chasing a stick imitates the chase and the kill, we humans are not as advanced above other species as we think we are.