It is not totally true or to immediately conclude that all products being sold during sale are substandard. There are instances wherein a certain company just needs to clear out their products to make room for new arrivals. This is called clearance sale.
My mom used to shop during these days because she said she could save a lot. She once shared that she was able to find american products pool light and since she is planning to place a swimming pool in our house next year, she grabbed the opportunity and bought several of it and some other pool equipment.