>> Surely a TV screen is way, *way* cheaper then nerve implant surgery?
>
> I was more thinking it would be used where it was not practical to have
> a TV or display, (eg a solider in the field, or a spy that didn't want
> others to know what they were doing).
>
> Still, if there is a demand and the implant process is developed then I
> don't see a reason why it should remain expensive, after all it's just
> going to be a chip and a few wires :-)

...and a team of highly trained experts to implant the thing, who have 
to be insured against being sued for causing death or serious injury...

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