[Scone]

Okay, here's a much better system to find a multiplier.

Take the difference between the victim and the killer's skills. For example, 5000 - 1000 = 4000.

Then take a number slightly larger than one to the power of this difference. For example, 1.0005:

1.0005^(5000 - 1000) = 7.4x the normal number of points
1.0005^(2000 - 1000) = 1.6x
1.0005^(1000 - 1000) = 1x (they have the same skill)
1.0005^(1000 - 2000) = 0.6x (killer is more skilled)

And it works nicely even if one of the players has a negative skill, or zero skill:

1.0005^(5000 - 0) = 12.2x

The only thing is you'll have to do some tweaking to find the optimum value - 1.0005 seems to work well with skills in this range. Hope that helps.