I've found it worth doing. My blog (xeiaso.net, formerly christine.website) is the main way that I get employed at this point. It also helps that people link it here a lot. After 100 articles or so writing got a lot easier and now people rely on my blog for a lot of things. I think it's worth it, but I've also been exclusively self-hosting it. I currently have the code (and writing) open source on GitHub (https://github.com/Xe/site) but I'm considering moving the writing to either a private repo or a SQLite database because people keep copying it, slathering it in ads and rehosting it.
EDIT: also because independent personal blogs are a rarity now, having a decent one means that you can really stand out from the crowd.
EDIT: also because independent personal blogs are a rarity now, having a decent one means that you can really stand out from the crowd.