Not to mention, Netflix is a flagship customer for AWS and directly results in AWS getting more business, so I'd expect the discounts to be even deeper for Netflix.
I remember reading something about how AWS is pretty much running very close to at cost (super razor-thin margins, just like the Amazon shops themselves),but seeing these numbers seems to imply otherwise (20% is a big chunk of change).
Isn't the opposite true? It's fine for under 10 instances when you're first starting up and still flexible, but over that you're better off going colo?
Also depends on what you consider a deal -- the lower tier hardware works for a Wordpress blog, but not necessarily for much more. For the price, a good Linode or even a dedicated server will get you more bang for the buck.