I think it is very good and healthy to not care too much about readership numbers, but you seem pretty high on your pedestal here - you still publish it to the public, you still seek an audience. If you’re doing it just for you, then why are you hosting a blog For the world to see? Surely there is some part of you that wants people to read it, otherwise you wouldn’t, right?

Just knowing that people could read my blog is forcing me to take better care of my writing. This is the most important reason. And only my friends and family know the address, it is not indexed :-D

Dunno man, sometimes I blog stuff I want to remember (how to do task X or Y, some arcane ffmpeg incantation, recipes, etc) and when I need it, it’s easier to find it in my public blog which is accessible from anywhere, vs. it being a file buried in some computer I have to sit in front of, or somewhere in a shared drive I have to authenticate to, etc.

For some things there is value in them being publicly accessible even if nobody but me cares or uses them.