My Mom read Library books frequently, even after her stroke.
New (purchased) books almost never. Used books, all the time.
Same in my house.
I would say less than 10% of my purchased books do not make it to completion (I got sucker into a author that was not to my reading style)
Note: It took me years to finish Mischner's Hawaii
, but I finished it.
Our house is littered with books. My wife's and mine (the cat like sleeping on them) 2 out of the 3 kids have big paperback collections.