This is interesting but I also wonder where the effect tapers off. I'm working on a startup in a particular space, and almost all competitors have high ratings on marketplaces but behind the scenes we know their churn is HUGE because people strongly dislike the products. Are some products just polarizing such that the highs and lows will be more willing to submit ratings while the displeased but unmotivated mids won't bother with a rating but will still churn?