The exhibitors don't WANT to have a public day at NAMM. It's been suggested many times, by retailers and public alike. The exhibitors are there to pitch product to the dealers, and honestly don't CARE what the public wants. Heck, a fair amount of what is pitched there is pre-release or vaporware, anyway. Look how often it's a year or more before the product ships...

Manufacturers don't want people holding off on a purchase waiting for something that may not be around for a year or more (if ever). Remember the Audya?