But remember, they're charging that $0.15/MB even for people who don't own a 3G-capable Kindle. In those cases it really is roughly a 120,000% markup over an already profitable service.
And those cell users can download the book multiple times at no additional cost, in perpetuity. So sometimes they may be taking a loss. It's really not all that simple, and I think calling it a 120,000% markup is dubious at best.
