Thanks. That comment was my biggest hitting one ever, so my average will probably jump quite a bit. Funny that it should be in a meta-karma thread.
I do see what you mean, I didn't think you were discarding comments from low karma commenters. I mostly wanted to bring up a point that is often missed in these discussions, that karma points might be very dependent on not only participation and quality, but on timing.
Given that using average karma as a filter is so blunt, an alternative way to express your method would be "I might see a high average karma as a reason to re-evaluate a comment that I initially discarded". Then it would be even harder to misconstrue into something sinister and karma elitist as I did :)
* Edit: from the comment below by mrduncan that shows how average calculation is done, my previous comment will not affect my average a lot. The max comment is sensibly ignored as a potential outlier.