The problem is that is that the demand is already quite high at the moment (retro is cool is seems) and the supply is only finite. Given there are decent enough reproductions I feel it seems a little ill-advised hacking the irreplaceable originals as once they're gone they're gone for good.

Plus if we are completely honest, a refurbished original would also have more longevity than one with a raspberry pi which will have an initial novelty factor but then quickly get forgotten about once the Pi becomes obsolete.