There's no question there's a lot of ebook readers outside the eink platforms but there's no telling how significant a segment tbey are; how many are avid readers buying dozens of books a year, casual readers buying one or two a year, or something in between. At most we can assume that the vast majority of eink users are avid readers. (Or independently wealthy and think nothing of spend $100 to read one book a year.
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(FWIW, I have all four platforms: phone, PC, eink, and multiple tablets. At one time or another I read of the latter three but when I settle down for extended reading it's the eink I reach for. Maybe I'm just weird.)[/QUOTE]
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May I assume that with eink, you mean e-reader?
I can only say that since I have my e-reader (first a Tolino, then my Kobo) I almost never read a paper-version book. Why? For a paper book you have to sit down, whereas I can do the dishes and read on my Kobo. Plus there's the weight of the paper books to consider if you're going outdoors.
I sometimes read an e-book (from Kobo or other) on my Huawei, but rarely.