Earlier arrangers had generic styles and none were song specific, yet, arrangers were still more expensive than synth workstations.
All the same, perhaps the added cost pertains to the content and development (and perfecting) of the technology needed to produce the styles, most instruments being made today using up to 8 tracks for a style.
Style parts on most instruments can have their own effects set ups, and, of course be re-voiced or completely changed by substitutions from another style, or physically recorded (played in) by the user.
Workstations, on the other hand, are pretty much empty musical content-wise (except for those with arps), and all content must be physically played in by the user....so that would effectively keep the cost lower, in my point of view.
When you consider all that happens when a style is being played (with all the chord recognition, their inversions, and the perfect interaction of those 8 different sounding tracks going on) it still is an amazing bit of technology.
I suppose that's why I'm still fascinated by arrangers, in spite of the alleged stigma, and I also suppose that is why forums dedicated to its use still flourish.
I really enjoy the instrument and appreciate what it does for me and my music.
Ian
_________________________
Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.