Both word and page counts for ebooks can also be distorted by the inclusion of teaser chapters from other books. It can be a surprise when reading to find that, instead of the expected 50 pages to go, you've suddenly reached the end.
If, as haertig suggests, the real problem/complaint is not wanting to buy into an incomplete story (at least until it is finished), then length doesn't really matter. You can be just as disappointed in a long book that doesn't finish as a short one (perhaps more so because of the time spent).
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