Why do people do this?

I've looked at several blogs over the past couple of years and I'm not real sure why people do them. What I have read on other peoples blogs is usually interesting and witty though. I am primarily doing a blog to talk about cycling and in particular MSG CX.

I'm sorry about the huge picture of me but every time I re size it it screws up the title font. Don't know enough about it to make work. This picture of me is my favorite taken by my son who is an excellent photographer but has quit cold turkey. I like it because it shows me doing what I like best: going downhill, through turns, fast, on a cross bike. Look at the intensity in my eyes, that's CX.