That's one thing. Then there's loss-leader sales limited to "2 per customer/family" or some such because they know someone would fill up their cart with it. Of

That's one thing. Then there's loss-leader sales limited to "2 per customer/family" or some such because they know someone would fill up their cart with it. Of course, if you self-check out and pay cash, they're less likely to spot you with the reduced supervision of self-checkout.