Agreed. It is noteworthy that we have an analogous situation here on HN. Karma is really a one-dimensional projection of a two-dimensional (at least) characteristic. People upmod because they agree, or because they think the post is interesting. This blends two quite different characteristics into one number. We could still argue that the value of a person's karma has a rough correlation with total value or contribution to the community, albeit two people may have the same karma values but have arrived at them through different means (say, one being agreeable, and the other being interesting).