You don't always know how valuable your comment is when you post it. That's why being validated through voting is so great. Being penalized for posting an opin

You don't always know how valuable your comment is when you post it. That's why being validated through voting is so great. Being penalized for posting an opinion that you don't even know will be popular is not going to end well. In this case, people will only post things that will give them high karma.