I think the point is that if you live in an American city with a professional sports team, you’re living in an area that offers way more than just a sports team; there are many things of note to do within a 20mi radius.
People who choose to live, say 250mi from the nearest major professional sports team are going to have a ton less job opportunity, things of note to do, but will generally have a lot less to pay because no one else wants to live there.
Ah that makes more sense, thank you! I wasn't looking at it as a proxy for surrounding development, but now I can see why that might be a more nuanced metric than just region size/population.
People who choose to live, say 250mi from the nearest major professional sports team are going to have a ton less job opportunity, things of note to do, but will generally have a lot less to pay because no one else wants to live there.