No, great question! Manufacturers have the option to select only quality LEDs from the manufacturing process via a sorting process. LEDs tend to vary in quality (color consistency, output, etc.) when they come off the line. By selecting the high quality LEDs, they can provide good consistency and color from lamp to lamp. This is important when buying LEDs.
You get what you pay for, so choose reputable manufacturers. Manufacturers are reporting improved processes these days with better percentage results which tend to help lower prices. It only gets better.