The question is why do we want a system where we should beg for ratings. Okay we can say that is the way world works, or we can try to do something about it.
You give a part the answer yourself, because it is been used a lot to gain a lot attention, and you will see games getting more then 80-90 ratings because of this system. And this is a lot in game jam where we this time only is 753 games. The issue here is not only the once making the posts, but also people continually replaying to all of them.