They are. I sold a chunk of my library, a couple hundred books, on Amazon, and saw sellers who would update their prices to be a cent or two below mine any time

They are. I sold a chunk of my library, a couple hundred books, on Amazon, and saw sellers who would update their prices to be a cent or two below mine any time they didn't have the lowest price. The other commenter is correct, that there's still profit to be made in shipping charges.