[jogjayr]

> When you resell a house, you are not denying the builders anything

You're denying the builder a sale of a new house.

Re-selling books is already legal. You bought a physical item, not the right to use the item. Ownership implies the right to dispose of the item as one wishes. You asked whether it was morally correct. I was showing you that many other things are frequently resold with no moral implications.