Flyers: Good or Evil?

For almost all of my listings, I have flyer boxes in front of the home to provide interested buyers (or neighbors) with instant information on the home.

Sometimes I wonder....

• Do flyers help possible buyers realize that a home might be perfect for them, and thus incite them to look at the home? or...
  
• Do flyers make some possible buyers discount the home as an option for them whereby if they had seen inside the home they might have been more moved?

And the bigger question....

• If I removed all of my flyer boxes would more or less buyers schedule appointments to visit the home?