There's something about books by people who live close to you. You feel this connection because you know the person writing the book walks the same streets, eats at the same restaurants and knows the same local gossip.
It's different than reading a book with a local setting. You can have a local setting by an author not living in your area and not feel as connected to it as you do reading a book by a local author set in a fantastical land a million years ago.
Thanks to Sydney Salter for reminding me that buying local doesn't just mean a stop at the indie store down the street. It also means supporting authors who live in your neighborhood.