Well, to keep one other player character, an 8th level Archmage in chaotic armor, 1000PPs, casting of level 20 spells within 1 round,... under control.
It was my first or second evening in that group and the rule was that everyone starts at level 1.
Now, 8 years later, things have calmed down. We are playing a nice group in a low magic world, so my level 8 paladin is desperately searching for a x2 PP multiplier (at least his sword is +10 magic).