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I don't know where the figure of 250 wpp came from, but it may be appropriate for ebooks, given the quality of today's screens. The only other figure I can come up with is 400 wpp for paper books, both hardcover and paperbacks. It's my experience that the paperback version of a book nowadays is a scaled down version of the hardcover, this based on actually counting the words on a page of a fairly wide variety of books, all fiction.
I should add that this may be a local value, since I think all the books I tested were Swedish.
Another thought - if a book is only available as a paperback, that figure of 250 could be right, since that would give a slightly more readable book than a scaled-down version of the hardcover. Although a loss of over a third of the number of words per page is very high for readability, especially the economic way publishers think these days.
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