DX is back- but not cheap enough

I found it interesting that Amazon had stopped production of the Kindle DX almost immediately after the iPad launched.  They were the most popular ereaders in our library, but they stopped production for the obvious reason that no one will buy a DX when they cost more than an iPad, which does everything but walk the dog.  Now they are back, but still cost more than their smaller counterparts, which is one of the most bizarre inversions of tech pricing I have ever seen.

Because the driving force behind the price of technology is size.  The smaller components cost more to make, which is why the smaller devices are so much more expensive than their larger counterparts.  That is the basic cost factor in tech pricing.  The DX does nothing different than a smaller Kindle as far I can tell, but costs way more.  I have no idea why.  I would guess that Amazon doesn't sell enough to lower the price. But this really makes me want to break one of our DXs open and compare its parts to the parts in the regular size Kindle.  Because as everyone knows, the iPad costs more because it is so much more than just a giant iPhone.  So why is the DX so expensive?  I am guessing that Amazon is just using it as a beta for a tablet they hope will help them compete with Apple.