That is true, to a certain extent. However, if you're willing/able to use Amazon SES, you can save a huge amount of money, while having comparable deliverabilit

That is true, to a certain extent. However, if you're willing/able to use Amazon SES, you can save a huge amount of money, while having comparable deliverability. Of course, with deliverability, there are no guarantees. Some email services do worse than self-hosted email, some do better. For most people with smaller lists (say 20k), the cost savings is not that significant. But, if you have a large list, providers such as Mailchimp are prohibitively expensive.