There can be several reasons why some stainless steel door handles are cheap to buy:

1. Material Grade: Stainless steel comes in different grades, with varying levels of quality and durability. Lower-grade stainless steel may be less expensive due to its composition, which may contain a higher proportion of other metals or impurities. These handles might be more prone to corrosion or wear over time.

2. Manufacturing Process: The production methods and processes used to manufacture stainless steel door handles can vary. Mass production techniques, such as stamping or molding, can help reduce costs by increasing efficiency and lowering labor requirements. However, these processes may result in handles that are less intricate or have a simpler design.

3. Design and Aesthetics: The design and aesthetics of a door handle can also impact its price. Handles with basic or minimalist designs are generally less expensive than those with intricate patterns, unique shapes, or ornate details. Simpler designs require less material and may be quicker and cheaper to produce.

4. Branding and Marketing: The brand and marketing strategy behind a product can also influence its price. Well-known brands often command a premium for their reputation, perceived quality, and customer trust. On the other hand, lesser-known or generic brands may offer similar functionality and quality at a lower price point.

5. Market Competition: The pricing of stainless steel door handles can also be influenced by market competition. If there are many manufacturers or suppliers offering similar products, it can lead to price competition, driving down the prices to attract customers.

It’s important to note that while some inexpensive stainless steel door handles may serve their purpose adequately, they may not offer the same level of durability, longevity, or aesthetic appeal as higher-priced options. Consider evaluating the quality, warranty, customer reviews, and reputation of the manufacturer or brand before making a purchasing decision.