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I think that it means that you did add to the person's reputation but that you cannot do so again, for this person, until you have added to the reputation of others first.
Anyway, that was my...

+1
Agreed.
In this instance, no elaboration needed.

Agreed. I'm a little leery of yet another rating system. I'd like to make my own judgment about the value of a person's post. Besides, even someone with a high rep can still be "wrong" on occasion...