Of course this is speculation on all our parts, so here's mine. I honestly believe that, aside from the people on this forum, most Americans (who even know what an arranger keyboard is) don't really regard them as legitimate instruments. I'd be willing to bet that EVERY other musical instrument, from a harmonica to a Grand piano, outsells arrangers on a one-to-one basis. At their worst, they delude lousy musicians into thinking that they sound good; at their best, they free good singers with modest (or easily learned) keyboard skills from having to pay capable musicians to back them.

Europe? The venues where arrangers are popular could probably also be covered just as easily by an accordion. JMO.

chas