You are assuming that their Business model is to profit from the difference in cost of shipping and prime subscription revenue. Rather than profit from a higher purchase volume if one has prime shipping than not.
I for one have observed that I have bought more things since I have had prime shipping. There is something to be
said for the quick response to your order in the form of 2 day delivery.
I for one have observed that I have bought more things since I have had prime shipping. There is something to be said for the quick response to your order in the form of 2 day delivery.