And thinking changes - I used to appreciate libraries until they screwed me over, left my interests and needs behind, and became a daycare center. I don't want to read romance novels nor juvenile fiction, regardless of how well-thumbed they are.
Since the books are well-used, that pretty obviously shows that the library is popular and doing a good job at serving some customers.
The concept of the utility of media is important.
If Family Guy was 24/7 every channel, approval ratings and viewership may still stay high.
Is that a proper way to measure utility, or value?
http://www.pewinternet.org/2016/09/09/library-usage-and-enga...
If we curated public buildings like libraries curate books, we'd all sell our libraries for $1.
My library tends to have a larger non-fiction section than most. Another town houses a huge collection of movies. Yet another hosts a tremendous audiobook collection. A simple online request will deliver any of these materials nearby or I can wander in and browse if I'm looking for something more mainstream.
Perhaps you should consider getting more involved if your library isn't meeting your needs.
1) arguing that public libraries are unneeded because you have enough money to buy your own books (and asserting that 'most of us' can similarly afford our own books, and therefore are not served by public lending libraries)
2) complaining that library collections are 'well-thumbed', while complaining that your favorite book got culled.