Well, that $300 was for a 12" screen, but you do have a fair point there. If there is target audience for that, maybe Eve should make one.
On the other hand, I don't really see the potential of all in ones. They're not portable at all, so they're basically the same as desktop computers, but you can't replace components in them. OK, they are a bit more compact than desktop computers, but I don't really see a situation where you would really need to save that much space. You can get a compact ATX case and put it under the monitor, or behind the monitor, or under your desk (like I did) - there is always some space somewhere, especially in those dark corners that you can't reach
And then the second question - is there a target audience? Isn't it better to get something like a Pyramid Flipper instead? You can add external graphics to it, if you need more computing power. And you get the bonus of it being portable. IMHO most use cases for the pen require it to be portable. For example, taking notes during a meeting, lectures, etc. - when you're on your desk, I can't think of any other use cases than professional (or hobbyist) drawing. But that is a much narrower user base, and AFAIK real professionals still prefer professional color calibration since the equipment they use in Wacom is more precise than the one they can have at home. But we need a real artist to confirm this, as I'm not one
But you're wrong about Crapple. They give people an already existing thing just wrapped into a nice package. IPhone? PDA. IPad? Microsoft Tablet PC (made by HP). Most of their products are actually less powerful than the things that existed before them. They sell just because of the tremendous marketing efforts. They did manage to create a big app market for their smartphones, but that was only after they became popular, and they became popular only because of marketing. I'd say it's unfair that someone (like Microsoft) creates something, then Crapple wraps it in gift paper and steals all the profit. And then when the original inventor comes back with an updated product, they're blamed for "copying". Look what happened with Microsoft Surface tablets - they got blamed for copying iPads, which were in fact just copies of the original Tablet PC. And Microsoft actually showed the world that tablets could be used for content creation, not only consumption. Unlike "someone else", who just convinced "iSheep" that they should buy their stuff by overusing the term "innovation" to the point where I avoid using it as plague because it became so lame and meaningless.