Geniune online user sentiment has died out a long time ago. If you're still basing any opinion or decision on what other "people" voted or commented online, you're easy prey for the algorithmic manipulation machine.
This is an along the same lines as the idea that every email should cost a penny. Like if every up vote or down vote cost a penny.
I don’t think it would fix things, except raise the bar for what is shilled and what isn’t.
in a way, the death of genuine reviews online may be a great way to bring it back to real life at a more realistic scale