I don't understand the objection to this. If a library puts a book out to be sold, why would it be happier to sell the book to one person than to another? Just because someone doesn't use a scanner to determine whether or not to buy a book, doesn't mean that he wants the book for the "right" reasons. So what if the purchaser may make money reselling the book later? If the original seller wanted, he could offer the book at that higher price himself. The fact is, he's satisified receiving the lower amount, except in cases where the buyer scans the book. This is envy, pure and simple. You get the feeling that the objecting sellers would be happier if the buyer was planning on burning the book, or using it to plan or commit a crime, than simply reselling it at a profit. Geesh.