I started as Billsbooks and now I sell more of other types of item. That is a confirmation that books are selling less freely over the last few years.
Eight years ago I had 5000 of my own books to get rid of, and between the River and Bay 100 a month would be going out the door.
I still sell books when the price is right, and it is never right on River, £2.80 delivery, or on Bay, too expensive to list. Now a trickle at low prices but Ebid is good for that.