1. It is reliable2. Amazon makes a profit on Amazon by purchasing low-priced goods on the Amazon platform and then selling them at a high price to make a profit. This method is reliable because Amazon, as one of the world's largest e-commerce platforms, has a huge user base and rich product resources, and the market demand is strong. At the same time, Amazon provides convenient sales channels and logistics and distribution services, making the profit a viable business model.

3. Amazon makes a profit on the price difference, which requires consideration of market competition and product selection. Since there are many sellers on Amazon and product prices and competition are fierce, market research and strategic planning are needed to select competitive products for sale. In addition, attention should be paid to product quality and after-sales service to improve customer satisfaction and loyalty. Taking all these factors into consideration, Amazon's profit on the price difference can be a reliable business model, but it also requires certain market insight and management capabilities.