History lesson: The first kindle sold for $400 IIRC
These days, you can get a fully tricked out Oasis (32 GB, Cellular connectivity), which is the most expensive current-gen kindle for $349.99 directly from Amazon.
Also, the 2nd, 3rd, 4th gens, and so on tend to get better and more reliable as technology matures and the bugs get found and fixed. If folding gadgets stick around long enough to happen, they might become an actual thing.
But, what I meant to say in this thread, the price is high, the benefits to me are low, and the technology screams "fragile" to me. And I'm hard on my belongings. So I'm out for now(EDIT: I mean on the tech, not necessarily the thread).
EDITED TO ADD: There's also this video of a folding ereader from a trade show
https://www.youtube.com/watch?v=D-kYQ61A-s4
But I suspect that's more of a tech demo than a product, I think, and it's over a year and a half old.