Why do people choose self-checkout over regular checkout?

While the self checkout system still has some user interface problems, the benefits seem to outweigh the flaws because many shoppers continue to use the self checkout lanes. The main benefits are:

It's fast! Top reason cited by random subjects surveyed at the supermarket.

Practically no lines. Compared to the regular checkout lanes, the self checkout line is usually very short or non existant.

It's efficient! Once you are familiar with the process, self checkout can be less of a hassle

You have control. You can decide whether or not you want to scan or return an item without the fear of annoying the cashier through your indecisiveness.

Privacy. No one looking at you funny and judging you as you purchase that huge pack of toilet paper or the pack of feminine hygiene products for yourself or your girlfriend.