I love imagining the surreal consequences of a world where reputation is far more valuable than the products themselves... but that must be unsustainable.
That has largely the same result. Most satisfied customers don't bother to leave a review, so real reviews tend to skew towards people who have had issues.
If you bribe satisfied customers into leaving a review then your reviews are no longer from the same sampling population as your competitors' reviews and you end up looking better than you really are by comparison. Plus, if the incentive isn't offered to everyone then people who get it (and then are disproportionately likely to leave a review) will tend to like the seller more because they liked receiving the incentive.
It would only be fair if the same incentive was provided to all buyers for leaving reviews of all sellers.
I live downstairs from someone who gives 5 star, raving reviews in return for "free samples". I'm not sure if it's for profit or for fun or what, but the rate at which Amazon delivery people deliver packages to our building is truly staggering.
I knew this was a problem mostly in the US, but just like one of the initial commenters noted, it's starting to happen even in Germany, and Amazon is now filled with all kind of weird cheap brands that have 4,5+ stars and 500+ reviews, you can't get any proper stuff like a humidifier or some small kitchen accessories without being flooded with spam. Well, back to local shops and retailers.
It's sickening.
This is not even mentioning incentivized reviwers who may be posting exaggerated (if not fake) reviews for promos, discounts, etc.
This is called brushing and there have been several articles written about it. Scammers create fake accounts for real addresses and then ship fake merchandise to those addresses to get the "verified purchase" for their review.
https://www.cbsnews.com/news/amazon-brushing-scam-couple-rec...
However, real crooks just compensate verified buyers by paying them via Paypal, Payoneer, etc. You can't protect against that except through court order or by private sting investigation. Amazon does sue organizers of these schemes and has untangled some in that way, but that is challenging to scale.