mark best response, positive,negative and report abuse in mylot

hi mylotters, I am observing these,MARK BEST RESPONSE,REPORT POSITIVE, REPORT NEGATIVE AND REPORT ABUSE ( words/rating/grading) or whatever we call them,in mylot, from the day i joined here.But i didnt understand the purpose of these, do we get any extra points if we mark the comment as best/positive or loose points if we give negative/report abuse.. please clear my doubt. thank you