You touched on a couple things that resonate. Firstly I'm one of those guys who likes to peruse the products in the midway and have seen it dwindle over the years. While I agree it's an internet commerce world - and I buy plenty that way - there's nothing like hands-on touch it, feel it, see it in person for me to evaluate products. Plus I can talk to reps who are not just phone jockey salesmen - they really know the products and applications. Even if I don't buy that day, I have made purchasing decisions. So to me a smaller midway actually detracts from my raceday experience - whether I'm racing at the event or just spectating - and reduces the perceived value of what I paid for at the gate.
Secondly, having the manufacturers on-site with a trailer full of parts means I carry less spares, or can actually get that gizmo I need to make the next round TODAY. NHRA should be working extra hard to attract these manufacturers back into the midway.
Well, we're about a mile off-topic now