There are portals that connect reviewer shills with sellers who want to boost their product ranking. Google &quot;buy amazon reviews&quot; and you&#x27;ll see it. Some do it individually, on fiverr for example.<p>The portals themselves are a very lucrative business, and are not going away anytime soon. There is an arms race between sellers to get that sweet sweet real estate (get their products on page 1 or page 2), and business can be a cutthroat matter. Of course, the system will eventually come to a steady state when too many buyers get burned buying crap. Review and feedback systems is a topic I&#x27;m very interested in.