How important is writing a blog for the success of your startup? I wouldn't write a blog if the only reason I do it is to help my business.
The three things he lists, coding, networking and blogging all have to do with expressing your point of view. That is the motivating force behind your startup: your need to communicate the way you see the world.
Haha, you wanted to make a timesink for others, but instead got sucked into one yourself! That's karma for ya.