The primary difference between cheap and expensive foot baths lies in their build quality, durability, features, and overall user experience. Cheap foot baths are typically made with lower-grade materials, which can lead to quicker wear and tear. They often lack advanced features and may not provide the same level of comfort and therapeutic benefits as their more expensive counterparts. In contrast, expensive foot baths are constructed with high-quality materials, offering better durability, additional features like heat settings, and improved ergonomics. According to a study by the American Podiatric Medical Association, foot baths priced over $100 tend to have a lifespan of up to 5 years, while cheaper models may only last for a year or two. This longevity is due to the superior craftsmanship and materials used in the higher-end products.