For example, when you reach that scale, you may have enabled some economy of scale for you that is unavailable to your smaller-sized competitors (like Amazon).

For example, when you reach that scale, you may have enabled some economy of scale for you that is unavailable to your smaller-sized competitors (like Amazon). Or, may be, there's some friction for customer to switch when you stop selling a dollar for 90 cents, like with american internet operators (I don't live in US but I constantly hear horror stories about Comcast here on HN, and I assume it's similar).