Give me a 10% discount on everything and I use them. I you don't, what is my motivation to use them? So they can fire part of their workers, replace them with a computer and keep the wages?
TBH: They are pretty rare where I'm from (Germany).
To answer your question: I don't want to work in any other job than my current one, because I like it.
I'm from Germany. Compared to the USA, the cashiers here are not forced to stand the whole day. Lots of my frieds worked in that job when they were at school or university. Not a bad job IMO...