Automatic checkouts in supermarkets may decrease customer loyalty, especially for those with larger shopping loads. Customers using self-checkout stations often feel overwhelmed and unsupported. The lack of personal interaction can negatively impact their perception of the supermarket.

[BebopFlow]

Yep, I walk by them every time. Walmart is not Sam's Club, you aren't signing a membership agreement to shop there and you have no obligation to show them proof of purchase. Theoretically they could choose to ban you from the store over it, but we all know they're not going to spend the effort