The realtors don't show the homes on Friday nights, Saturdays or Sundays. The buyers don't bother to drive around and investigate the area.
I worked with an idiot "engineer" who bought a home in a new development right next to the East Windsor Speedway in NJ. With a good arm you could have thrown a rock from his backyard that landed on the track property. He told me that he never knew there was a race track there and complained about the noise. He never even bothered to drive around the block to discover the track was there. Short story: community activist group complained and the track was shut down. A little McMansion development with about 50 homes in a once corn field.