They may be unwilling to promote it more (or even update it for that matter) because DX probably targets the market which is not very eager to buy Amazon's content, which doesn't exactly fit into Amazon's business model.
Like, if you want to read reflowable content, 6" is just fine. If you're getting DX, you're probably someone who needs to read a lot of pdf's. And pdf's are in 90% cases not bought from Amazon, but downloaded from you institions' library/JSTOR/company website - name your own resource of pdf. Now, that type of customers are definitely not the ones Amazon is looking for.. so, no, I don't get my hopes high.
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