The problem is that increasing costs for unpopular content doesn't necessarily mean that your content was bad, just that people weren't paying attention to it. If you're ahead of a tech curve, that doesn't mean your contributions are bad per se. It means that other people didn't appreciate them at the time.
So if you do implement a system like that you're basically codifying the herd mentality much more strictly than it probably should be.
So if you do implement a system like that you're basically codifying the herd mentality much more strictly than it probably should be.