In this case, it was more that the bridge and groom lived in an area they'd moved to after college and the vast majority of their friends and family still lived in the areas where they'd grown up. She had a couple friends from grad school, he had a couple friends from work, but the locals only made up ~15% of the guests.

It's kind of like when my cousin got married in 2001 - she and her husband lived in New Orleans, but her family lived in Connecticut/New Jersey and his lived in Texas/Colorado. So sure, them getting married in New Orleans wasn't a destination for them, but it was for the vast majority of their guests