Chas, you’re quite right when marketing to musicians. However, as has been discussed ad infinitum, arrangers are targeted at the home player.

I’ve started a couple of folks with little musical or keyboard experience on arrangers. And, I may be doing a community ed. presentation on them.

Also, the school that I teach at periodically has a dozen or so basic arrangers to teach basic keyboard in their music class.

If students take to the arranger, many will move on to some sort of piano.