Yes the Yamahas sell a lot, but let's face it, I daresay the majority of sales go to home users, who probably also have not changed their vote for 60 years either...or brand of underwear
More accurately, the majority of arranger sales from BOTH Korg and Yamaha are to the home user/player.
Let's face it, the arranger is (and started out as) a "home keyboard", with some models adding advanced (or, if you like, "pro") features like sequencing/audio recording/Wav & MP3 playback, Audio Drums etc., but the
primary market is for the home player, whether they be beginner or advanced.
Any instrument with "Single Finger"
Easy Play chording is still a "Home Keyboard",
in my opinion, but some enterprising professionals do take advantage of the instrument's features and use them for gigging.
It's been that way since the earliest arrangers, so nothing has really changed. I think our Donny (dnj) was using a Korg SAS-20 back when hardly anyone used an arranger on stage, but you can bet he was in the minority (but he
was working, nevertheless).

Ian