Just anecdata, but 2 years ago Amazon incorrectly shipped me a 90lb granite surface plate instead of a 1lb set of calipers. Return shipping was ludicrous enough

Just anecdata, but 2 years ago Amazon incorrectly shipped me a 90lb granite surface plate instead of a 1lb set of calipers. Return shipping was ludicrous enough that customer service offered a ~90% discount if I elected to purchase it. So a software snafu (because I doubt a warehouse worker would ship an item that heavy out of laziness) cost them significant money, and extrapolate that cost by the number of orders daily: a serious glitch could run to millions of dollars in short order, and have long-term loss of trust issues for the business.