Bezos, who's never been a fan of ad-supported models, said the key problem for online publishing is the Internet's infinite inventory. "The biggest structural problem in my opinion is that there's just so much supply of advertising space. That's a fundamental problem that's not going away," said Bezos. So, both Brill and Bezos would agree newspapers cant rely only on advertising to survive, but obviously differ on how much, if anything, Amazon should get for Kindle newspaper subscriptions.