Well, when you break down the moral of the story,
Scarface is about a man who came from nothing, and did what he had to do to make his life what he wanted it to be. Basically, a "rags to riches" story. These rappers can associate there own lives with this, I suppose. It's irritating, to be sure, but its just the way it is.
BTW--Has anyone seen that "Birdman Lugz" commercial, where the "Numba 1 Stunna" completely bastardizes
Scarface? Some cheap attempt at being "cool", when it was actually just stupid.