Yeah this stuff is real. At the restaurant I used to work at, one guy would take down the number off of business credit cards, then use the number to buy food and tip their friends very well at other restaurants. Their friends would do this and come into to see him and repay the favor. Usually it was businees cards so people might not look at the records as close. I dont know if the caught him specifically, but before I left we had to have a manager approve any cards that we had to type the in the number because it didnt swipe.