I don't have a hard and fast rule, but I don't mind leaving some books unfinished. I don't buy too much on impulse though -- I've usually managed to determine the book will hold my attention before I buy. I slowly expand my wanted authors list and the more I get, the less often I'm disappointed part way through.
Since I'm in the middle of around 10 books at a time at all times (gotta have variety), plenty of even of decent books have long hiatuses while I dig into others that are either better or better suited to some long term mood of mine.
I'm more likely to not finish non-fiction than fiction. Oftentimes I've gotten the non-fiction for specific reasons and not every chapter is even really in my ballpark. Of my unfinished non-fiction books, it's often not the ending that I didn't read, but portions of the middle that weren't of interest.
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