My 'basic ignorance' of marketing extends to the fact that, if one company can address a minuscule market, and make a profit, any other one can, too...

They forget to teach you that one in marketing school?

And, once again (none so blind as those that keep their eyes, ears and mind shut) Yamaha have NOT ignored that 'minuscule' market segment. In fact, they have a whole DIVISION dedicated to it. They make 76 arrangers, and 88 arrangers. JUST BAD ONES...

But doing that is great marketing, isn't it, Ian?
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An arranger is just a tool. What matters is what you build with it..!