The reality is that the majority of non fiction books are written by authors with perverse incentives - as a writer you can mostly make money by writing a complete book, whether or not you have a books worth of things to say about the topic. My approach has been to try and read 1 or two books a year but make sure they matter. The few books I do read, I remember most of their good parts and find them valuable and rewarding. Almost all of my friends and colleagues who are self proclaimed voracious readers never seem the wiser from it, not like they can recount any specific instance of a book affecting their life or decisions in any way at least.
All of this is about non fiction of course, fiction books are a whole another animal!