Companies don’t need trade shows anymore.
They have digital.
I just came back from CES. While there were plenty of individuals that were interested in our product, that wasn't why we were there (no one sells things at CES or NAMM AFAIK), it was for the corporate connections, distribution partners, parts suppliers, contract manufacturers, plastics suppliers, etc, etc, etc. and potential business partners that you put up a show for.
I am not sure that NAMM has the same gravatas as CES, but one final arguement for a trade show is that it shows a company is serious. I can tell you that even a relatively small 20x20 island booth at CES will run a company around $100,000.00 to $150,000.00 all in. And you wouldn't even believe all the crap that "all in" covers. Shipping of booth to CES, carpet, carpet pad (which is insanely 2 times as expensive as the carpet), table and chair rental, mechanical setup labor, electrical drop (not included with the 20K you pay just for the 20x20 space btw), art work, CES Unveiled fee, Pepcom fee (both are media only events), prototype products, stands, shipping, and of course, a week of travel to Las Vegas in the most expensive hotel rate times every for anywhere from 10 to 20 people within the company to man the booth, supervise the booth setup and tear down, give interviews, take business meetings (a separate meeting room can be rented as well at a silly high price), a weeks worth of product shirts for the company people so attendee's know you belong to the booth and product .... and I am positive I forgot a ton of other things that popped up.
In other words, you must have some spare change in your company, and some intention of bringing a product to market for real to shell out this kind of money. FYI, a 20x20 booth isn't that big either. I suspect that some of the big boys at CES shelled out $500K to $1M for their CES adventure. The money associated with these things is simply insane.... AND my feet and back are still angry with me

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