[AlexanderHowl]

0% power modifiers can be fun. For example, you could have a 0% power modifier with the following modifiers: Backlash, Ecstasy, Resisted by HT, -50%; Cosmic, +50%. While it would not give any points back, it offers a significant bonus and penalty, and would result in interesting RP opportunities (the reason to have Ecstasy rather than Agony would be to prevent munchkins from using High Pain Threshold to reduce the severity of the Backlash).