The fact that we don't see the really violent ones, is indeed because the discharges dissipate energy in effect neutralizing the electrical differences. And we do see electrical interactions between a planet and a moon: Jupiter and Io are strongly interacting, and the Electric model sees the "volcanoes" that are active on Io as an electrical arc (like an arc welder) producing exactly the type of features that can be found on many moons and planets, the biggest one is Valles Marinaris on Mars.
Cheers.