Harry,
I agree 150%, but you are not the one missing something, it's the model companies that are missing it.
I've done a few class sponsorships at some of the bigger "local" shows, and the exposure can't be beat. All totaled my investment is a bit under $200, but most of my regular customers are coming from those model shows. Definitely a small investment for big gains.
Obviously the big model makers don't need to let people know that they make models, but it never hurts to put out your hand to your customers, and say "Hi".
IMHO,
Jameston