Why 'Bought Last Month' Beats Star Ratings for Spotting Real Demand
A star rating is an average over a product's whole life. The bought-in-past-month figure answers a sharper question: are people choosing this product right now, at today's price, against today's rivals?
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Two products, same category. One has 4.6 stars across 8,000 reviews. The other has 4.4 stars across 2,100 reviews, and Amazon says 3,000 people bought it last month. Which is the safer buy? We’d take the second one, most days, and this post is about why.
Star ratings are a lagging indicator
A star rating is an average over the product’s entire life. Those 8,000 reviews may be concentrated in 2022, when the product was current, well-priced and actively supported. The listing keeps its shiny 4.6 while the product ages out, the seller stops answering support emails, or a quiet revision swaps components. Ratings decay slowly; products decay fast.
Review counts also compound survivorship: a listing that sold heavily years ago keeps its mountain of reviews forever, and shoppers keep reading that mountain as if it described the product on sale today.
Purchase velocity is a leading indicator
Amazon’s “bought in past month” figure, shown on many listings, is close to the opposite. It doesn’t care how the product did historically. It answers one question: are people choosing this product right now, at its current price, against its current competition?
That number quietly encodes a lot of due diligence other shoppers did for you. Current buyers saw today’s price, today’s alternatives and today’s reviews, including the recent ones mentioning the quality drop, and bought anyway or didn’t. Strong current velocity on a mature product usually means the price is right and the product still delivers.
It’s also much harder to fake
Review manipulation is an industry: buy the product, get reimbursed, leave five stars. But faking purchase velocity means actually generating thousands of real orders every month, indefinitely, which is just called selling. A seller can sculpt their rating; they can’t easily sculpt sustained sales volume at scale.
How we use these signals
ProductDome does not rank by stars and does not rank by sales. Every list is ordered by how many people search for each brand and model every month, which is the one signal that is even harder to manufacture than sales: nobody searches by name for a product they have never heard of. Ratings only break ties between products with the same search demand, and a product whose rating sits low despite plenty of reviews is left out of the catalog altogether. Purchase velocity is a shopper’s tool, and a good one. Use it on the listing page.
The two-signal habit
The takeaway as a shopping habit: read the stars for quality, read the purchase velocity for relevance. A great rating with dead sales is a museum piece. Decent rating, strong monthly demand? That’s the product the market is actually choosing, and the market checks more spec sheets than any of us.
Disclosure: ProductDome publishes this blog and runs the product catalog it links to. We describe how the catalog works rather than promise results, and we do not test products ourselves.
Key takeaways
- A star rating is a lifetime average and lags years behind a product that has quietly changed.
- Purchase velocity reflects buyers who saw today's price, rivals and recent reviews, and bought anyway.
- Faking sustained monthly sales at scale is just called selling; faking a rating is an industry.
- Read the stars for quality and the velocity for relevance. A great rating with dead sales is a museum piece.
Sources
- Amazon Community Guidelines for reviews: the rules reviews are supposed to follow
Links last checked October 20, 2026.
Frequently asked questions
Where does Amazon show how many people bought a product last month?
On many listings, under the title, as a rounded figure such as '2K+ bought in past month'. Amazon does not show it on every product, and it can be per variant rather than per family.
Is a high star rating with few recent sales a bad sign?
Often. It usually means a listing that sold well years ago and is coasting on old reviews while the market moved on. Check the most recent reviews before trusting the average.
Does ProductDome rank by ratings or by sales?
By neither. Every list is ordered by how many people search for each brand and model each month. Owner ratings only break ties between products with the same search demand.