Also, the Cult of Dunkin is founded on several legs besides maple frosted doughnuts and/or Munchkins.
1) Free wireless
2) Clean bathrooms
3) Reliably cromulent egg sandwiches that aren't too unhealthy: i.e., emergency nutrition/fast food that doesn't have to hurt.
4) In many places, open all night.
Also, they have a corporate sense of humor: