I am sure this is true of brand loyal people that stick with models like Korg Pa series. I am not so sure about those graduating to higher models, like Yamaha psr 975 to a Genos, The only regret may be the money spent.

I have always had several keyboard brands in my stable so not to miss out on that "VOILA" arranger that would make me a star. Of course, that never happened, but I slowly acquired enough experience, and loaded enough registrations to play any at a gig. As it is, I have different boards that I like very much for what they are. I think it depends on your expectation.

This isn't what Bill is saying, to which I agree. Companies have to maintain a certain OS long enough to recoup R and D, adding small enticements in between.
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pa4X 76 ,SX900, Audya 76,Yamaha S970 , vArranger, Hammond SK1, Ketron SD40, Centerpoint Space Station, Bose compact