Speaking personally, I know I'm just that much more likely to do a 50 piece McNugget and large Peanut Butter Crunch McFlurry combo when I don't have a laser-eyed teenager there at the register to judge me.
I was reading some franchise owners report on this and their labor cost hasn't changed but order sizes and "premium" food ordered has increased after adding kiosks. MORE DERAILMENT SORRY OFFICER J-DOG