The rating feature is not used very frequently by the editors. We do use the negative rating frequently only to mark copied content and spam responses. The others we use to mark responses ranging from invalid to excellent. The old template then used to display bright yellow stars if this feature was used. What we do now, though, is to assign enhanced points & cc directly as this can be done simultaneously instead of first using the rating feature and then adding the cc. It is hoped that the yellow stars' feature gets restored. Note that, in the earlier template, a grey star used to appear for irrelevant responses and it would be marked with zero points right away.
As Partha rightly pointed out, the rating is not related to cash credits.
When people come at you with their worst, you should come at them with your best (advice given to Selena Gomez by her mother, quoted in Time magazine.)