The way that I'm thinking about it is this: that it is relatively unusual, from the standpoint of the community, for a high-karma user to upvote a low-karma use

The way that I'm thinking about it is this: that it is relatively unusual, from the standpoint of the community, for a high-karma user to upvote a low-karma user. Karma is a measure of the norms of the community, parceled out to users.