The way the points are figured out is by this method:
Victim's Points
Killer's Points
Multiply that by the weapon modifier = Total Points gained for that kill.
For instance, if a person who is new (1,000 pts), killed me (12,000 pts) with a bone saw, the would get 36 points. Because...
12,000/1,000=12
12*3 (weapon modifier for bonesaw)=36
If I'm not mistaken, the max points you can get is 25 per kill. The minimum points is 2.
Every time you die, you lose those points, so in my above example, the person who killed me would have 1,036 points after the kill, and I would have 11,964 points.
Hope that helped.