Scan and Pack

Popping into Tesco for a few bits on the way to the playscheme, I have been really rather impressed by the new scan and pack tills:
Novelty. It's fun scanning the items yourself.
No need for small talk first thing in the morning.
No queues. Other people seem to eye these lanes suspiciously thus there is never anyone in front of you.
You're in control.
I have only experienced one problem. The till calls out the price of each item. I was ever so slightly alarmed when the pack of 4 bouncy rubber balls marked up at 32p came up at £199. The computer thought they were a diamond ring...
There is something of the Luddite about me though. I was in rather a quandry earlier; arguing the morality of scanning my own shopping. Am I doing someone out of a job? I know that next time I drop by for a pint of milk I'm going to end up arguing with myself – queue or no queue? Keep someone in a job or rush through without a care?
If only life were simple.