This is a good example of marketing folks "getting it wrong" for power users. Having had conversations with people who were responsible for the requirements spec on tablet/ereader type devices and listening to them explain to me that while a 250+ppi screen looked great, it wasn't the "lighthouse" feature that would justify the sales price.
I suspect a bunch of people don't care. But I certainly do. It remains to be seen if we're a market worth pursuing though.