So, you go out to dinner with your mates. You get a joint bill and then split the total, because it is so much easier. Can you photocopy the one receipt and produce that for audit, claiming an appropriate share? If so, what is to stop you making a few more copies and giving a spare to your mate who decided to eat in Burger King that night?
Then there is the subject of the tip for the nice waitress, especially in those countries where tipping is almost mandatory. Is an additional 10% on your bill total going to be acceptable?
Wouldn't it be nice if we could have a system where they just gave you a reasonable sum of money for each day that you were away, and you could just spend it as you wished......?