They're not that great for the stores, honestly. You have tons of people who don't really know what they're doing, asking for help for every item they can't easily scan. The people have to constantly reset the tare on the scale because it's just slightly off, and the scale is the only way they know for sure you're not defrauding them. Coupons can be a pain in the ass to deal with. Then there's the people who are just really slow at putting stuff in their bag, and in the end it's more efficient to have more express lines.
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