This isn't a dig at you, but because you are kind enough to come on here and impart valuable knowledge to us, I can ask you...
I know it's different for you as we are not your customers directly, the various suppliers of equipment are, however, they may be interested to see what you have coming out, or give you some ideas, likewise we, the end user could give feedback to you.
Maybe your mindset is shared by other suppliers who just simply don't see it as a return on investment.
Maybe it's more of a goodwill thing, and for me, the chance to see and play with some toys, well, I'd be spending money, as I'm sure lots of others would.
Truth is, suppliers can't be bothered, neither can I.
Will they lose out? Probably not, as I still need to buy gear from somewhere!