What rating does to the freelancers cannot be quantified. That's why majority of the freelancers always convince their clients to rate them. Imagine a client you now use most of your efforts on that doesn't still rate you. That's why some freelancers always, like an appeal, ask their clients to rate them. They always want them to recommend them if it is allowed. How will you feel as freelancers when you don't get rating when you are expecting it?