Price is really only relevant for me when it's a short story/novelette - I wouldn't want to pay a full-length novel price for those. (Not that I care for short stories/novelettes anyway, but I make the occasional exception for those set in the same universe as a series I've read and enjoyed.)
For novels (say, anything above 60,000 words), I don't really consider length an important factor in pricing - it's the description / author / other stuff that determines whether I want to buy a book at the set price or not.
I don't think I've ever even deliberated between 3-4 books of a similar price and made the decision based on the length/thickness; it's still "which one of these sounds the best content-wise / which one do I want to read the most" that is the most relevant factor. (But again, I'm the sort of person who's a lot more likely to avoid a 800+ page book because of the length, unless I have good reason to expect I'll enjoy it.)
It's definitely something that would be useful to many other people though, and with ebooks, it would be such a simple thing to include... I mean, even the publishers don't provide the information, I'd assume that there would be a relatively simple way to do an automatic word count on the provided file (and perhaps round it up/down so that it won't look ridiculous, e.g. 142,900 or 143,000 words instead of 142,887 words).
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