Then if it was one silly lowball offer, people must not want it as bad as you think.
Not relevant.
If I, for example, think a book is worth $10,000, but the market thinks, through multiple established sales, that the book is really worth $1,000, but my only offer....for whatever reason....is $500...forcing me to sell it for $500 isn't going to fly with anyone.
I think we're now getting into technicalities of "worth". If it's worth $1,000, someone should have hit the BIN for $1,000 (or sent a similar Best Offer).
If no one did, perhaps the worth is less than $1,000.
I don't implement eBay's rules; this is just a hypothetical attempt to get more books (items) sold and less clutter. Additionally, no one would be forcing the seller to use eBay. If you really want that $1,000, setup at a show or offer the books here, or Facebook, or Instagram for $1,000 and see if someone bites.