It's a very good strategy, well worth the investment now to remain at the forefront while more and more businesses shift to the cloud.

I don't think any other cloud provider has as many employees as them. They have over 300+ job openings at the moment, but not sure as how to many AWS related jobs are currently filled.

Looks like their two-pizza team rule keeps them nimble enough.

If you look at,

http://aws.amazon.com/about-aws/whats-new/

Then it is almost one significant announcement per week.

I'm not sure of the exact number, but I have heard that they have something like a 12-18 month backlog of things to release for AWS.