No clue. By my office, there is a Starbucks two doors down from a local coffee shop that offers pretty much everything Starbucks does (all of the espresso-based drinks, etc.), only cheaper and much better. And yet, every morning, people are lined up out the door at Starbucks, while the lines are much shorter at the other place.
It would be interesting to watch the customers at each business. I might be interested in checking out the women at the non-Starbucks place.