Marathons have become big business as running has grown in popularity. While the proportion of people who run (half) marathons pales in comparison to the proportion who are professional sports fans, I nonetheless noticed something anecdotally. Nearly every runner I know travels semi-frequently to compete in races, and often with family/friends coming along. Initiatives like Team in Training coordinate travel for large groups. With this, they are spending on hotels, entertainment, and other amenities and experiences at their destination.