Why does Dunkin love geofencing?

In Boston Dunkin is a religion. But what about secondary markets? For years DD has turned to mobile geofencing to help solve their problem. In Philadelphia and Washington DC Dunkin as geofenced their locations. Placed an ad for their mobile app. If the consumer downloaded an app they received a free medium hot coffee. If you are the customer you walk out with a free coffee. If you are Dunkin you know that each downloaded app will generate an extra $1,500 in revenue. So when Dunkin needs to help in a DMA it rolls out a mobile geofencing program. How can mobile geofencing help your business?