One gets the impression that he also doesn't zap things once they already have other zaps on them. It would be as if he thought those zaps were somehow tainted by the filthy zaps that came before them. If that's the case, it's a loophole in the system and could be addressed. He might be seeing valuable content and restraining because it has already been zapped and it would pull his ranking. Early zapping seems like a good incentive, but not at the cost of quality zapping.

Moreover, he may be a wizard. The profile picture looks like a wizard. If so, that would be something that the algorithm unfortunately wouldn't be able to address. This is because wizards use magic. They do so with spells and enchantments, which are not typically open source.