I'm pretty sure he's still worth only a 100 points.
Yes he should be worth a lot more, probably a 1.000 points since the bitch doesn't stay dead. The other guys that were 70 -odd points died a lot more easily than this bitch. But I'm sure that a 100 is the maximum number of points that can be awarded to any single kill.
Or you know, Gantz is just being a douche.