[=;336627]
I have noticed that very few people leave reviews for the items they have purchased. It might be useful to send them a timed reminder to review the items after a while of having purchased it (like Amazon does).
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I think a big reason for that is few use the website in comparison to the launcher, where reviews are currently not accessible. Your proposed solution could work, but I think implementing reviews and ratings into the launcher could achieve the same result, all while solving another problem. =)