Personally, I don't upvote or downvote based on a person. I upvote or downvote based on the content of an individual node, and sometimes I'll upvote and downvote the same person in the same day.
My main fear in upvoting as a favor or out of admiration/respect/love/fear/whatever is that I don't want to lend that little bit of extra credibility to a node I find detrimental. If I see marginal advice, I'm going to comment on it. If I see bad advice, I'm going to downvote it. If I see really bad advice, I'll probably do both.
I have at times wanted to upvote the same node twice for a really good, comprehensive reply to a question that someone has asked. I can imagine that this wouldn't be an outrageous thing to allow to the person who posted the original question.
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