I'd be interested in hearing about how this went from you guys. Something wasn't working when I went to try to do it (can't remember what exactly) but I ended up not submitting.
I'm trying to understand how overdrive works. I asked my local librarian and got this:
Overdrive is the nationwide mechanism for borrowing free ebooks and digital audiobooks through your local public library. It's not a digital version of our collection, so if Overdrive has a given title, it means that book's publishing house made the title available through Overdrive. So when you the patron request a given Overdrive title, the library does not need to purchase it. Either the title is already in Overdrive, or if it's not available, it means the publisher declined to participate. In that case, you can still request a print, CD or Playaway copy through us.
Overdrive limits the patron to downloading no more than five titles at the same time. The titles will delete themselves off your device as their due dates roll around. You can also return/delete a title ahead of time if you wish. For detailed instructions, go to https://mvlc.overdrive.com/ and click Help in the upper right-hand corner. Scroll down and choose whether you're interested in ebooks or digital audiobooks, and you'll be taken to a FAQ that covers all the bases. Thanks, and let us know if you have any other questions.
Emphasis on free is mine. So I guess the takeaway is if you have permafrees, offer them on Overdrive as well. I have managed to sell 5 copies of one book and 1 of another on Overdrive, so I assume some libraries somewhere bought them. I just went to check my permafrees on D2D and it won't let me list them for free. The lowest price allowed is 99 cents. So, hmmm.
When they talk about free in that context, they totally mean free to their library users, not free in any other sense. :D
The libraries themselves buy the licenses that allow them to offer the books to their users. Overdrive gets a cut/charges libraries a fee, so of course it's in their interest not to allow "free" books, etc, and generally most libraries want a system with a gatekeeper of some sort, so they don't really want "free" either, because "free" is associated with junk.