I've heard various ideas such as limiting it only after mods have expended their points (this will require implementing a cooldown to prevent a user from getting points again too soon). I want to hear your feedback, and I'll roll together something for the next major update of the site. Leave your comments
Interesting point. I will point out the obligatory/obvious fact that you can easily register an account while maintaining some degree of anonymity - it's not like you have to provide a SSN to register - and thus obtain the same benefits registered users do. That said I'm personally not opposed to giving a bit of a bump to Anon Coward posters. (Heheh SSN - Soylent Security Number? :P)
I think you will find the current setup is mostly just due to how slashcode was built. On that other site they needed subscription revenue, so it sort of makes sense that the system would give some buffs to registered users to encourage them to subscribe/maintain their subscription. If SN ends up on a donation-based system these sort of incentives may have less use/importance.
[Posted without karma bonus out of respect for parent's point of view]