I like the concepts of blogs but I can't see very many men I know taking the time to actually sit down and read them- which is why I never jumped on that bandwagon.
I definitely agree that you shouldn't really use it to post pictures (i.e. give away content for free) because your website gallery/portfolio should provide you with the place to update your photos. A blog, to me, seems more like a place to write your personal ramblings/musings on whatever topic strikes your fancy. And like I said, I just can't imagine very many men taking the time to read all of that.
I think with a well thought out website, visitors should be able to get a good enough idea of who you are and what you are like :-)