You all miss the point. (Score 1)

I don't work for free. Would you?

Self serve checkouts don't eliminate a job, they eliminate the cost of getting the job done.
When I'm asked by a manager if I wouldn't like to get out of line and use a self serve checkout terminal, I tell them I'll gladly do it, but only for some sort of a discount. I've had this conversation several times, and they all got perplexed in a "we never looked at it that way before" look on their face.
Sure you didn't...