And there, my friends, is the kiss of death for audio styles. You got to sell a LOT of styles (in an environment where there is no copy protection for them) to pay for a $20,000 style cost. Seriously... $20K for a style, several hundred styles in an arranger... who's going to do this, other than for the ROM styles (the sale of the arranger is what offsets the style development costs)..?
NEW styles are the lifeblood of an arranger. If all you get are the ROM styles and a few new ones every year or so, then have to sell it and get a new one just to have the latest big batch of ROM styles, sorry... just not interested.
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An arranger is just a tool. What matters is what you build with it..!