As well as buying books with copywritten translations and books with additional material, I've also bought PD books because I wanted to read them and they were not yet available on the PD sites I knew about at the time. Living in a country that was until recently life+50, it hasn't been uncommon for books to be in the PD domain and available for purchase but not yet posted on a PD site.
This also avoids any moral or legal considerations involved in downloading a book that isn't in copyright for my location but is in copyright at the host site :-)
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