I'm not too proud to admit that a large number of my amazon purchases are low-price impulse buys. I'd imagine I'm far from alone in this.
I'm sure if you totaled up my Amazon purchases and my Steam library it's cost me thousands.
It's too bad they haven't expanded faster - Walmart just barely rolled out their curb side pickup service where I live - if Amazon had made it here with same day delivery even just a few months ago we'd be customers for life, but as it is we'll probably stick with Walmart for groceries even when Amazon does eventually get here. (better the devil you know, etc.)