To me, the convenience of not having to wait in the regular checkout line, and being able to bag things as I want them bagged, is worth the small amount of work necessary. That’s my "discount".
Like Fieldthistle, I’m usually there before 6:00am, not a lot of activity then. At that time of day they only have one set of doors open, I’ve wondered why the only attended register is always at the other end of the store. This morning I realized they were making people walk past the self checkouts, I guess it’s an attempt to make us use them.