For any given search many websites have an economic incentive to be at the top and are willing to understand the process and jump though some hoops. However, jumping though hoops has zero correlation with quality and only minimal correlation with relevancy.

It's not an easy job to find a useful mattress review website or whatever, but Google's users don't care about easy they care about how useful something is. Even worse Google's actions end up changing the websites they are linking to. It's a slow but vicious cycle that I don't have a solution to, I just finally realized what the problem was.