I had a friend in college who would go to Starbucks every weekend, order a drip coffee and read a copy of the New York Times for hours. After, he would put the

I had a friend in college who would go to Starbucks every weekend, order a drip coffee and read a copy of the New York Times for hours. After, he would put the newspaper back without paying for it. So I always wonder about how these places find a balance with customers that are profitable and those that are, well, moochers.