This idea has been tried and rejected on this forum. I am sure someone can come along as point you to a thread that explains it in depth. But, the biggest issue was that it caused far, far more trouble than it was worth. It was little more than a popularity contest, and people were making numerous fake accounts just to vote for their favorites. All sorts of hurtful things were said.
Like I said, it was more trouble that it was worth, and I don't think that it will be repeated on this forum for quite some time if ever.