Sure, it works great if you're a single person who doesn't have all that much to buy, but here's the thing; if you're shopping for a family or a multi person household or whatever, and you have to buy a lot of things at once, your self checkouts just plain suck ass because pretty much no matter what you do, you'll get dinged with an error message every ten or 12 items and have to wait for the overworked and underpaid attendant to come free you up so you can keep going until the next inevitable fuckup.

Self checkout is fine if you have something like 15 or less items, but anything more than that and it's more trouble than it's worth.