I assume that cost is including things like flights, hotels, shipping a whole pile of your amp range etc. Especially if you can't just take them to a dealer afterwards, or sell all of them at NAMM, but have to bring them back to Canada.
You can check the prices for exhibiting at NAMM here:
https://www.namm.org/thenammshow/exhibit/2024
For example BluGuitar is going to be at NAMM and last year they had I think one of those 5x10 foot spaces that cost $2295 USD, fits a couple of their cabs and a few Amp 1s on top. I think for Blug it's more about seeing friends in the industry who are all over the world.
So it's a shame that tradeshows like this are going away, but also understandable if the costs have become prohibitive. For releasing products in the Internet age it's just easier to control the narrative by releasing your product at the right time, rather than when everyone else is doing it as well.