Writing on a blog is a very inexpensive way to establish your credibility about different subjects. This pays off later down the line when you can link people to things you've written in the past.

Credibility is a very valuable commodity. It's worth investing in ways to build more of it.

Don't assume people will stumble across your content (though they will eventually via Google). Actively send links to people who you are already engaged in conversation with.

It's not the number of readers you have that matters: it's their quality. I'll take a dozen people reading my stuff who might engage with me usefully or lead to future opportunities over a thousand readers who don't match that criteria.