Why buy the more expensive calculator with feature X when you can add that feature to your cheaper device with a software upgrade? I imagine some of the difference between models might be mostly software.
Someone commented the other week that this could cause the revocation of certain models... 'approval/certification' for use in specifically defined settings, particularly in formal testing (ACT?, SAT? -- I don't recall) and therefore in classes that work towards that testing. That person made the point that this might have significant implications for future marketshare.
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P.S. Not that I'm a fan of the DRM involved.