Bezos also revealed in the interview that Kindle owners read four times as much as they did before they bought the Kindle, but they don't stop buying paper books either.
Mr Bezos made clear that the devices' success would depend on how many books and other media files were subsequently bought by their owners.
"We want to make money when people use our devices, not when people buy our devices," he told the BBC.
By contrast Apple has indicated in the past that it makes much of its profits from device sales while running its iTunes store "slightly above" break-even.