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mirin_gains one thing I have noticed myself was echoed in your post, where you mention the BMW dealer's sales person knew more about the car than Subie/Yota salespeople. I personally think that if these cars were sold alongside 1/3 Series coupes, Porsches, and such they would actually SELL. Toyobaru sales just don't have a clue how to market a vehicle that doesn't fit the bulk of their target demographic...
It's fun having a car that's like a guarded secret society thing, but in the long run I think we know what happens to "niche" vehicles.