Originally Posted by applewine
My idea did take care of the problem of re-selling the paper books though, because they were bought at full price, so that is no different. It will not further lower the used book price.
I disagree. For the publisher, they don't care about whether the paper book is bought at full price or at a discounted price, what they care is how much TOTAL money they get, and that is the revenue from both eBook and paper material. It's a total lose lose situation for them in that scenario because they either get the same revenue as before, or they lose a customer due to sharing.
The only way this would work is to somehow lock down both the eBook AND the paper copy or they have to work some magic with the pricing. Finding a price that creates more demand (and therefore more revenue) that covers how much they lose from discounting.