Well, OK, new to me. But then the concept is too.
There are so few books I've not finished that the fingers of one hand more than suffices. For years, I've simply been unable to conceive why one would start reading a book and not finish it. But then I've always been a rapid reader and there have been few periods in my life when I couldn't find sufficient time and space to read.
Amongst those few reads are a couple of books I Did Not Finish because I lost my copy and wasn't so engaged that I sought out another one. But I only made one active choice to stop reading a book - when after each (of three) failed attempts, I totally lost my love of reading, which then took months to regain ... every time. It was a book I'd long wanted to read, on paper the subject matter was right up my street, but ... no.
But, the combined facts of my increasing age and the overwhelming nature of my huge to-be-read pile and list means that it's something I am starting to consider. As is my usual way with all things, I read about it ...
A collective of writers, editors and reviewers expressed their views on the subject at TheSem10ticStandard and Chuck Wendig expressed his (decidedly more pithy) view on TerribleMinds.
The crazy thing is rather than making me feel easier about giving up on books, I looked at the comprehensive articles from the viewpoint of a writer. I wanted to ensure that I learned lessons, to avoid making those mistakes. Have I crossed some invisible line in my head?