I've used mint.com for over 12 years so I have purchase history going back that far from both WM and Amazon. I consider myself a relatively heavy user of Amazon for small ticket items with a few big ones mixed in (with 65 orders YTD) and I'm in Smalltown America so no Whole Foods grocery delivery.

It's actually an interesting exercise to look at long term spending at stores. In the past 12 years I've spent $37k @ Amazon compared to nearly $50k at WM. Big numbers, but averaged out that's not all that much. Most of my grocery spend in recent years has been at WM due to it being the closest grocery store and is within walking distance of my house.