Is the ratio of superK users to subK users sufficient such that they won't spend all of their time approving comments?
Back of the envelope calculations from where I sit suggest that this has no choice but to slice the number of comments by at least an order of magnitude (and I actually think it is closer to 2 orders of magnitude).
If that's really the goal, why not just implement a comment killer that every now and then just randomly stomps on a posted comment and blocks someone from posting for 15min/30min/hour/whatever when it fires.
If you tie the probability to karma and karma ratio, it would do almost as good a job and not inconvenience the superK folks. And you could tune it to get the comment posting rate that you want.