I work in a multi billion dollar company. When I go to the shipping/receiving area I see a lot of AMZN boxes. My buyer says it is just easier to buy things on $(AMZN)$. I pointed out that tools I needed were $2 at McMasters and $6 on AMZN. His response was "Amazon is just easier to order from" Point is even if Amazon is not the cheapest people buy from them because it is convenient.