I bet most of the people who genuinely take it as a hobby make more money then those who do it for the money. If you give value in life someone will pay you. Most blogs deliver no value but want money.
What I mean by that is you build a great blog on say pets and blog about it all the time because you absolutely adore pets. Eventually you'll get offered $ for ads, or throw some adsense etc.
I think many people here blog for reasons besides $.
I do the
blog reviews for fun and to help people with some suggestions; it's been operating at a loss the majority of the time. I do 90% of the reviews for free which I pay a writer.