It's a very good point. Those billions of reviews globally, if you exclude fakes and then divide by the numbers of products out there you get maybe 100 reviews per popular product (median number of reviews for all products is definitely zero). How many of those 100 reviews would be in my wot circle? If the 100 people I follow posted 100 reviews each, I would only be considering maybe 0.01% of all popular products. That doesn't seem good.

The solution could be a wider wot circle, and start from niche, and more reviews. If I knew my reviews wouldn't be lost in some corporate database, I might have posted more of them.

Also it will probably vary based on physical proximity to my contract list members. They would probably review a lot of local products, but not much in Dubai or on Alibaba. So maybe travel is not the best place to start.