What is the expected behaviour of "Comments are Made on content I write" notifications setting?

This setting is confusing our members:

They have this enabled, and because there's no other context on the page, they assume this means "if I create a blog, an article, a forum thread, a wiki document, then I will be notified about comments on the content that I write".

However, they discover that when they create content, it does not automatically select for them 'notify me of comments on this content' or however that's appropriately phrased for the content that they have created.

This has caused a huge amount of problems for our members, they aren't notified of comments on their blog posts to be able to go back to them, and other content. This means that we're left with users asking questions and thinking that the Community is dead.

I'm open to explanations and solutions.