I have been following the advice of the Shark and reading much more widely than I used to in my chosen category/genre. It's brilliant. I get to read outstanding stories, I constantly reaffirm how much I enjoy my category/genre, I support authors in it by attending their events and buying their books (and sometimes I make direct connections with them), and I learn something from almost every book that helps me refine my own writing. One recent book gave me ideas on how to handle dual POV that are directly applicable to my WIP. Another was notable for its outstanding voice and characterizations, yet another for its creation of a beautifully strange world that was both like our own and not.As you might suspect, having won one yourself, my favorite ploy for reducing inventory is running a flash fiction contest and sending books to the winner.
The only downside is that shelf space at home is growing tighter and tighter. I would be happy to give away some of these books, but I am mindful of not wanting to cannibalize sales of new books. Do you have favorite ways to pass books on to others that maximize the benefits for both authors and readers?
That option is not the best for people who don't have an exaltation of readers lining up with quill and ink to write contest entries.
I think the best place for used books is the Friends of your local library donation box. When I moved to New York City I donated my entire collection to the Friends. (They needed a pickup truck for all the boxes.)
As to your concern about cannibalizing front list sales: Friends of the Library sales won't do that. For starters, the people who attend that sale are generally library patrons already, and thus their library most likely has a copy of most of the books you'll be donating.
Second, the FoL sale is a great way for readers to find new authors.
Third, in supporting the public library you're helping an institution that is the foundation of democracy and that's no small thing.
[Not for nothing does Brother Muzone extol the benefits of a library card]
Free access to a wealth of knowledge is way a person can rise in the world regardless of circumstance. I sincerely hope no one would fault you supporting that.