Have you ever go to just about ANY music store (With a VERY few exceptions a la George Kaye, etc.), and the sales staff have NO CLUE how to even turn on some arranger Keyboards disregard the brand?.
Well, since the NAMM show is for Dealers (not intended for public), this Demo is a little tool that may help them, SInce most can not demo or play and arranger.
Just my opinion.
You missed my comment on the second type of Demo, that is what you want to see More showcase, keep in mind that there are 2 very different types of demo.