I thought the same until the time they saved me $50 because I was charged for three of something I only bought two of. That the person noticed this in the span

I thought the same until the time they saved me $50 because I was charged for three of something I only bought two of. That the person noticed this in the span of about 5 seconds on a receipt of about 30 items and a fairly full cart was quite impressive. Bag checkers at BestBuy, on the other hand....