We recently took a weekend trip to Manhattan. I could bore you with the details, but the important thing to note is that we learned there are 171 Starbucks in Manhattan.
With a land area of only 22.96 miles this means there are roughly 7.5 Starbucks every square mile. We literally saw Starbucks across the street from each other, and you never walk more than 3 blocks before finding one.
We hit up 3 or 4 of them. I wish I would have thought of charging $6 for a cup of coffee.