As others have said, I don't believe your existing karma influences the weight of your new comments. However, I would think that patio11's, edw519's and others

As others have said, I don't believe your existing karma influences the weight of your new comments. However, I would think that patio11's, edw519's and others' reputation attract karma more easily than the "regular" commenters. I mean that people are more easily convinced by whatever they say because they trust their reputation.