[jeffesp]

This ignores the fact that there might be a fixed cost per book. If it is 10% of the current book price, then you are making no profit. Books don't just grow on trees. It also assumes that I have time for 10x as many books because they are cheaper. Currently, my time is more of a premium than my convenience or money.

[lliiffee]

It seems to me that the marginal cost for an ebook is indeed zero. (Or very, very nearly zero: do you count the cost of the electricity or bandwidth to download it?) You disagree?