I’m hazarding a nearly entirely ignorant guess but I would expect a certain amount of it could be to maintain fluidity in price and respective profit margins through time. Especially now, if a speaker company isn’t making everything in-house using domestically-sourced materials, a certain amount of volatility could ensue. Even some domestically-sourced materials would be a crapshoot in that regard.
The last full-range speaker made by the company I use encountered such a disaster. The speaker had a generally well-respected price-to-performance point, but due to overseas manufacturer price hikes in the aluminum cabinet, the speaker price increased almost 2x between two generations (of essentially the same product).
The speaker was still a strong performer at its new $6,500 price. But how do you explain that to everyone who saw them before for years at $3.5K?
And their website did always have the price listed clearly. That may have wound up being a bad look over the long haul.
Like I said though, just spitballing. I’ve noticed the same thing re: prices - they need to be on a dealer website but it’s hit-or-miss.