I was raised on DD. The original store was only 2 miles from my house when I was a kid. They were only 2 blocks from the Quincy, MA police station. The shop was constantly being robbed due to their location and the easy getaway, so they started giving free coffee to the local cops. Having the cops constantly pulling in and out of the parking lot seemed to cut down on the robbery rate.
Their quality isn't nearly as good as it was years ago. Up until 20 years ago, they made donuts 24hrs a day. The company policy was that any donut sold was to be no more than 2 hrs old. They would throw out trays of donuts every 2hrs to make room for the fresh stuff coming out of the back room. Same with coffee, if the coffee was more than 20 minutes old, it was dumped and a new pot made. Never had to worry about stale donuts and bitter coffee until they changed these policies.