Why are some 50,000-plus-review brushes rated lower than smaller sets?

High review volume builds confidence in a rating, but Amazon averages are gameable and don't capture bristle shedding or durability over time. In this pool, mega-popular budget sets sit at 4.5–4.6 stars while smaller premium-brand items hit 4.7–4.8, which suggests buyers are slightly happier with the pricier picks even though far fewer people have weighed in.