This is always my issue with Amazon. I'm a developer, so I can do it, but it always frustrates me how many steps are involved in the setup process. And you're right, I think that's what keeps people from switching.
With that being the case though, I think I'm going to switch to SES. Mailchimp is way too expensive. Me and my brother were literally just talking about this a few days ago. It's expensive because at one time they were the best option. But as you've shown, that's not really the case anymore. And 34x difference in payment. Wow!
Thanks for sharing this article, I'm about to switch over.