Regarding cost per unit. I think the publisher likes this type of partner because they can really get their initial order volume up high without much risk. This allows them to have a super low cost per unit, maximizing profit, from the start.
> initial order volume
None of the books you get through this program are new releases. But they are printed special for imagination library.
Yup, and the “industry standard” wholesale discount publishers give to e.g. bookstores is usually 55%