Back in the olden times overcharging like that would be dealt with the same way as theft would. I'm not entirely convinced it's the wrong way to go about things

Back in the olden times overcharging like that would be dealt with the same way as theft would. I'm not entirely convinced it's the wrong way to go about things. It's how the concept of a bakers dozen came to be. Better give everyone 13 in a dozen, just in case you ever miscount.