Mine started as an emailed (free) weekly humour column sent to friends. It got passed around and I ended up with a couple of hundred subscribers. Occasionally, I'd sell one of the columns to a newspaper or magazine. Then blogs started happening and I started fiddling with one. Eventually, my emailed column merged with the blog because I got tired of formatting material twice.
For the first couple of years, I'd mention my book or include an Amazon link in every column. But for the last few, I only mention the book a couple of times a year, if that. It still seems to be selling okay without my help.
I don't make a nickel from blogging, nor do I want to. And I no longer write just humourous stuff, or weekly. I write/post what I want, when I want. The freedom is fun and even a technodweeb like me can (eventually) learn to navigate Blogger's software.