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DERP score is how much impact a particular group has on the reward pool. It's up to the author of the report to assign, but a good guideline is to look at their daily rewards. If the group has little exposure, then it might make sense to 10x the number to estimate what impact they might have if they used all of their voting power on themselves.

DERP score is just one aspect to all this. A group could have a very low DERP score and still require a lot of resources for containment.

The reports are used for research on containment of problematic behavior, but also for entertainment. They're a little bit like horror stories mixed with cautionary tales.