Why do some towel warmers have thousands of reviews and others only a dozen?

Review volume tracks how long a product has been on the market and how widely it sells, not necessarily quality. In this category the established bucket warmers have thousands of verified-purchase ratings, while several newer foldable and smart racks have only single-digit or low-double-digit counts. A 4.9 average from 13 reviews is far less reliable than a 4.5 average from several thousand.