Multiply the time you spent on setting up your favorite blog engine by your hourly rate. It's not $10, though likely not $10k, even if you choose self-hosted WordPress.
I think you can get set up with a domain and static site generator and run it through something like GitHub pages in an hour or two. I personally spent a lot of time writing up a bunch of Jekyll templates and Sass because I have strong NIH and want full control over my website, but for those who don't care (presumably which includes those using Medium) you can get up and going with zero ongoing overhead with just the default themes and stuff.