[mjd]

As a longtime and successful tech blogger, I endorse this position.

The tech blog is primarily for personal growth and may also help get you a good reputation.

The personal growth is the important part. The blog gives you practice thinking about things and writing them down. It extends your memory by building an archive of your ideas. And it is fun.

The reputation part may help you attract better job offers.

Several people have suggested writing a book. Having done this, I will say: Do not do it for the money.