How much money do you think grocery stores lose because of the self service scanners?

I’ve always known I could beat the thing, I choose not to. Today, however, I was punching in the number for Portebella mushrooms, and accidentally punched in the code for lettuce. It asked me to list the quantity. Since I’d already screwed up I just punched in 1 for the hell of it (I had 4.) I was curious to see what might happen. Would a big sign flash on the screen calling me a liar? Would lights and sirens come on? Nope. Nothing. A charge of $1.99 came up. I shook my head, and called the cashier over to correct my mistake, knowing full well that the charge for the Ports was going to be a lot more than $1.99. (Like, $7.95 as it turns out.)

Do you know of anyone who plays those scans to their advantage?