The main driver for the limit was to prevent someone registering one or more accounts and being free to vote everything down.
Well, in that case, we could just pick a threshhold and say anyone above that level gets the keys to the ammo closet.
ETA: Or the garden shed, to stick with the going metaphor.
Our friends at Tricycle will push through a zero-based karma system (no self-voting possible) sometime this evening. At present this will only cover future posts/comments - they may go back and revise history some time in the indefinite future (or not), but apparently that would be overly complicated for now. We'll see how this works.