What happens when you vote someone up or down?
Most Helpful Girl
Nothing. It's just a way of showing that you agree or disagree with what someone had to say. It doesn't affect anyone's Xper in any way.
It may have an effect on how a Most Helpful Opinion is automatically chosen by the system (if the QA waits too long and never chooses it themselves), buut I'm really not sure what all goes in to that.1