I find the selection of books often/usually depends on which charity shop I’m in. I’ve been (very slowly) culling my literally thousands of books, and after asking their staff, donate certain genres/authors to certain shops.
I’m definitely not a book snob, enjoy many different genres/authors, and agree with others that it’s (probably) better to read any book than no book. I would make an exception for The Shades of Grey books however. I read a few bits of the first one one day when I was in Tesco, and couldn’t stop laughing, it’s so bad. Annoys me that E.L.James has earned so much money when there are far superior writers selling far fewer books/earning a lot less money.
The nemesis of my book collection is Ulysses, I’ve tried reading it every few years, get a wee bit further on each time, but will have to live to a very, very old age if I’m ever to finish it.