~/Library/Containers/com.evernote.Evernote$ du -cksh 469M . 469M total
$35/year seems like a lot for an app, but self-hosting only the storage would exceed that cost on any platform that supported running my own applications. I wouldn't self-host a server as important as a repository of my personal knowledge.
What about Google Keep?
I was burned pretty hard by Google when Google killed Google Notebook and then launched Google Keep a few years later and no ability to transfer my data, so I want to keep my notes with a company that takes my long-term data seriously. I still don't think it wise to store my notes with Google even for free. Even though it does everything I want from a note-taking app. Evernote even alludes to this fact in the marketing material around this change.
Evernote isn’t a vast corporation, and note-taking isn’t a sideline for us. It’s what we do, and we strive to do it better than anyone else. We hope you’ll continue to capture your thoughts and develop your ideas with us. [source]
I've been burned so many times by Microsoft's embrace and extend, it's going to take a long time before I can be sure Microsoft would actually support all of the platforms I want to be able to access my data. I'd rather trust Google.
SimpleNote, Todo.txt, Other?
I really like the ability to take a picture of my hand-written notes and then search for them. I'm willing to pay for this feature. I'm not aware of another cloud-based service with this feature other than these.