07-15-2012, 06:55 PM
I'll bet it has to do with resist values - people with extremely high or low resists aren't noticing the difference, either because their resists are so high it doesn't make much difference or so low they die quickly anyhow. The median are probably the ones suffering - they notice the extra damage because they go from "survivable, if rough" to "why am I dead?"
Finally satisfied that this, in fact, a game in the Diablo series.