This is how you get free coffee at Pret A Manger -- look attractive

British high-street cafe Pret A Manger revealed today that it sold one million cups of coffee a week during the 52 weeks to January 1, 2015. Overall, the coffee shop's sales rocketed 16% year-over-year to £594 million ($884 million). So it's little wonder that it can give away free coffee. According to Pret A Manger's CEO Clive Schlee, the chain gives 28% of its customers free coffee, purely on the basis of whether the staff like you.  "We looked at loyalty cards but we didn't want to spend...