We don't do a large volume on ABE, but find it worth listing on. It is especially good for international orders because you always have the freedom to ask for more shipping if you need to. This is the only venue on which we currently sell internationally.

Also, I tend to think that a different sort of crowd uses ABE and so we are more likely to sell our harder to find, more expensive out of print books there than on some other venues.

hi
i was on and off abe about 3 times. recently since amazon took them over there is a slight improvement. Basically, however most of my abe sales are on older collectable books. so if most of your inventory is newer stuff don't bother. a note that once I got lucky and popped a $400 book on abe.
regards
don