1 interview out of 3 resumes seems like a good rate. I've only sent three, but that's because I realized the economy wasn't getting better any time soon.
"Ran an advice blog" definitely looks better on my resume than "got really good at writing resumes."
I'll start sending them out again once unemployment drops a couple percentage points, but I've made more money from this blog than I would have lost driving around asking for jobs (which is a double digit number, but still meaningful).
I mentioned this here some months ago in a similar thread, and I'm only more sure of the value in doing this now. :)